# Buggy code
def main():
    # Parsing argument file
    module = AnsibleModule(
        argument_spec=dict(
            autoconnect=dict(required=False, default=None, type="bool"),
            state=dict(required=True, choices=["present", "absent"], type="str"),
            conn_name=dict(required=True, type="str"),
            master=dict(required=False, default=None, type="str"),
            ifname=dict(required=False, default=None, type="str"),
            type=dict(
                required=False,
                default=None,
                choices=[
                    "ethernet",
                    "team",
                    "team-slave",
                    "bond",
                    "bond-slave",
                    "bridge",
                    "vlan",
                ],
                type="str",
            ),
            ip4=dict(required=False, default=None, type="str"),
            gw4=dict(required=False, default=None, type="str"),
            dns4=dict(required=False, default=None, type="list"),
            ip6=dict(required=False, default=None, type="str"),
            gw6=dict(required=False, default=None, type="str"),
            dns6=dict(required=False, default=None, type="str"),
            # Bond Specific vars
            mode=dict(
                require=False,
                default="balance-rr",
                type="str",
                choices=[
                    "balance-rr",
                    "active-backup",
                    "balance-xor",
                    "broadcast",
                    "802.3ad",
                    "balance-tlb",
                    "balance-alb",
                ],
            ),
            miimon=dict(required=False, default=None, type="str"),
            downdelay=dict(required=False, default=None, type="str"),
            updelay=dict(required=False, default=None, type="str"),
            arp_interval=dict(required=False, default=None, type="str"),
            arp_ip_target=dict(required=False, default=None, type="str"),
            # general usage
            mtu=dict(required=False, default=None, type="str"),
            mac=dict(required=False, default=None, type="str"),
            # bridge specific vars
            stp=dict(required=False, default=True, type="bool"),
            priority=dict(required=False, default="128", type="str"),
            slavepriority=dict(required=False, default="32", type="str"),
            forwarddelay=dict(required=False, default="15", type="str"),
            hellotime=dict(required=False, default="2", type="str"),
            maxage=dict(required=False, default="20", type="str"),
            ageingtime=dict(required=False, default="300", type="str"),
            # vlan specific vars
            vlanid=dict(required=False, default=None, type="str"),
            vlandev=dict(required=False, default=None, type="str"),
            flags=dict(required=False, default=None, type="str"),
            ingress=dict(required=False, default=None, type="str"),
            egress=dict(required=False, default=None, type="str"),
        ),
        supports_check_mode=True,
    )

    if not HAVE_DBUS:
        module.fail_json(msg="This module requires dbus python bindings")

    if not HAVE_NM_CLIENT:
        module.fail_json(msg="This module requires NetworkManager glib API")

    nmcli = Nmcli(module)

    rc = None
    out = ""
    err = ""
    result = {}
    result["conn_name"] = nmcli.conn_name
    result["state"] = nmcli.state

    # check for issues
    if nmcli.conn_name is None:
        nmcli.module.fail_json(msg="You haven't specified a name for the connection")
    # team-slave checks
    if nmcli.type == "team-slave" and nmcli.master is None:
        nmcli.module.fail_json(
            msg="You haven't specified a name for the master so we're not changing a thing"
        )
    if nmcli.type == "team-slave" and nmcli.ifname is None:
        nmcli.module.fail_json(msg="You haven't specified a name for the connection")

    if nmcli.state == "absent":
        if nmcli.connection_exists():
            if module.check_mode:
                module.exit_json(changed=True)
            (rc, out, err) = nmcli.down_connection()
            (rc, out, err) = nmcli.remove_connection()
            if rc != 0:
                module.fail_json(
                    name=("No Connection named %s exists" % nmcli.conn_name),
                    msg=err,
                    rc=rc,
                )

    elif nmcli.state == "present":
        if nmcli.connection_exists():
            # modify connection (note: this function is check mode aware)
            # result['Connection']=('Connection %s of Type %s is not being added' % (nmcli.conn_name, nmcli.type))
            result["Exists"] = "Connections do exist so we are modifying them"
            if module.check_mode:
                module.exit_json(changed=True)
            (rc, out, err) = nmcli.modify_connection()
        if not nmcli.connection_exists():
            result["Connection"] = "Connection %s of Type %s is being added" % (
                nmcli.conn_name,
                nmcli.type,
            )
            if module.check_mode:
                module.exit_json(changed=True)
            (rc, out, err) = nmcli.create_connection()
        if rc is not None and rc != 0:
            module.fail_json(name=nmcli.conn_name, msg=err, rc=rc)

    if rc is None:
        result["changed"] = False
    else:
        result["changed"] = True
    if out:
        result["stdout"] = out
    if err:
        result["stderr"] = err

    module.exit_json(**result)


# Traceback (IndexError)
The full traceback is:
Traceback (most recent call last):
File "/tmp/ansible_cTdlxy/ansible_modlib.zip/ansible/module_utils/basic.py", line 2736, in run_command
cmd = subprocess.Popen(args, **kwargs)
File "/usr/lib64/python2.7/subprocess.py", line 711, in __init__
errread, errwrite)
File "/usr/lib64/python2.7/subprocess.py", line 1207, in _execute_child
executable = args[0]
IndexError: list index out of range

# Fixed code
def main():
    # Parsing argument file
    module = AnsibleModule(
        argument_spec=dict(
            autoconnect=dict(required=False, default=None, type="bool"),
            state=dict(required=True, choices=["present", "absent"], type="str"),
            conn_name=dict(required=True, type="str"),
            master=dict(required=False, default=None, type="str"),
            ifname=dict(required=False, default=None, type="str"),
            type=dict(
                required=False,
                default=None,
                choices=[
                    "ethernet",
                    "team",
                    "team-slave",
                    "bond",
                    "bond-slave",
                    "bridge",
                    "vlan",
                ],
                type="str",
            ),
            ip4=dict(required=False, default=None, type="str"),
            gw4=dict(required=False, default=None, type="str"),
            dns4=dict(required=False, default=None, type="list"),
            ip6=dict(required=False, default=None, type="str"),
            gw6=dict(required=False, default=None, type="str"),
            dns6=dict(required=False, default=None, type="str"),
            # Bond Specific vars
            mode=dict(
                require=False,
                default="balance-rr",
                type="str",
                choices=[
                    "balance-rr",
                    "active-backup",
                    "balance-xor",
                    "broadcast",
                    "802.3ad",
                    "balance-tlb",
                    "balance-alb",
                ],
            ),
            miimon=dict(required=False, default=None, type="str"),
            downdelay=dict(required=False, default=None, type="str"),
            updelay=dict(required=False, default=None, type="str"),
            arp_interval=dict(required=False, default=None, type="str"),
            arp_ip_target=dict(required=False, default=None, type="str"),
            # general usage
            mtu=dict(required=False, default=None, type="str"),
            mac=dict(required=False, default=None, type="str"),
            # bridge specific vars
            stp=dict(required=False, default=True, type="bool"),
            priority=dict(required=False, default="128", type="str"),
            slavepriority=dict(required=False, default="32", type="str"),
            forwarddelay=dict(required=False, default="15", type="str"),
            hellotime=dict(required=False, default="2", type="str"),
            maxage=dict(required=False, default="20", type="str"),
            ageingtime=dict(required=False, default="300", type="str"),
            # vlan specific vars
            vlanid=dict(required=False, default=None, type="str"),
            vlandev=dict(required=False, default=None, type="str"),
            flags=dict(required=False, default=None, type="str"),
            ingress=dict(required=False, default=None, type="str"),
            egress=dict(required=False, default=None, type="str"),
        ),
        supports_check_mode=True,
    )

    if not HAVE_DBUS:
        module.fail_json(msg="This module requires dbus python bindings")

    if not HAVE_NM_CLIENT:
        module.fail_json(msg="This module requires NetworkManager glib API")

    nmcli = Nmcli(module)

    (rc, out, err) = (None, "", "")
    result = {"conn_name": nmcli.conn_name, "state": nmcli.state}

    # check for issues
    if nmcli.conn_name is None:
        nmcli.module.fail_json(msg="Please specify a name for the connection")
    # team-slave checks
    if nmcli.type == "team-slave" and nmcli.master is None:
        nmcli.module.fail_json(msg="Please specify a name for the master")
    if nmcli.type == "team-slave" and nmcli.ifname is None:
        nmcli.module.fail_json(
            msg="Please specify an interface name for the connection"
        )

    if nmcli.state == "absent":
        if nmcli.connection_exists():
            if module.check_mode:
                module.exit_json(changed=True)
            (rc, out, err) = nmcli.down_connection()
            (rc, out, err) = nmcli.remove_connection()
            if rc != 0:
                module.fail_json(
                    name=("No Connection named %s exists" % nmcli.conn_name),
                    msg=err,
                    rc=rc,
                )

    elif nmcli.state == "present":
        if nmcli.connection_exists():
            # modify connection (note: this function is check mode aware)
            # result['Connection']=('Connection %s of Type %s is not being added' % (nmcli.conn_name, nmcli.type))
            result["Exists"] = "Connections do exist so we are modifying them"
            if module.check_mode:
                module.exit_json(changed=True)
            (rc, out, err) = nmcli.modify_connection()
        if not nmcli.connection_exists():
            result["Connection"] = "Connection %s of Type %s is being added" % (
                nmcli.conn_name,
                nmcli.type,
            )
            if module.check_mode:
                module.exit_json(changed=True)
            (rc, out, err) = nmcli.create_connection()
        if rc is not None and rc != 0:
            module.fail_json(name=nmcli.conn_name, msg=err, rc=rc)

    if rc is None:
        result["changed"] = False
    else:
        result["changed"] = True
    if out:
        result["stdout"] = out
    if err:
        result["stderr"] = err

    module.exit_json(**result)