# Buggy code
def create_connection(self):
    cmd = []
    if self.type == "team":
        # cmd=self.create_connection_team()
        if (self.dns4 is not None) or (self.dns6 is not None):
            cmd = self.create_connection_team()
            self.execute_command(cmd)
            cmd = self.modify_connection_team()
            self.execute_command(cmd)
            cmd = self.up_connection()
            return self.execute_command(cmd)
        elif (self.dns4 is None) or (self.dns6 is None):
            cmd = self.create_connection_team()
            return self.execute_command(cmd)
    elif self.type == "team-slave":
        if self.mtu is not None:
            cmd = self.create_connection_team_slave()
            self.execute_command(cmd)
            cmd = self.modify_connection_team_slave()
            self.execute_command(cmd)
            # cmd=self.up_connection()
            return self.execute_command(cmd)
        else:
            cmd = self.create_connection_team_slave()
            return self.execute_command(cmd)
    elif self.type == "bond":
        if (self.mtu is not None) or (self.dns4 is not None) or (self.dns6 is not None):
            cmd = self.create_connection_bond()
            self.execute_command(cmd)
            cmd = self.modify_connection_bond()
            self.execute_command(cmd)
            cmd = self.up_connection()
            return self.execute_command(cmd)
        else:
            cmd = self.create_connection_bond()
            return self.execute_command(cmd)
    elif self.type == "bond-slave":
        cmd = self.create_connection_bond_slave()
    elif self.type == "ethernet":
        if (self.mtu is not None) or (self.dns4 is not None) or (self.dns6 is not None):
            cmd = self.create_connection_ethernet()
            self.execute_command(cmd)
            cmd = self.modify_connection_ethernet()
            self.execute_command(cmd)
            cmd = self.up_connection()
            return self.execute_command(cmd)
        else:
            cmd = self.create_connection_ethernet()
            return self.execute_command(cmd)
    elif self.type == "bridge":
        cmd = self.create_connection_bridge()
    elif self.type == "vlan":
        cmd = self.create_connection_vlan()
    return self.execute_command(cmd)


# 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 create_connection(self):
    cmd = []
    if self.type == "team":
        # cmd=self.create_connection_team()
        if (self.dns4 is not None) or (self.dns6 is not None):
            cmd = self.create_connection_team()
            self.execute_command(cmd)
            cmd = self.modify_connection_team()
            self.execute_command(cmd)
            cmd = self.up_connection()
        elif (self.dns4 is None) or (self.dns6 is None):
            cmd = self.create_connection_team()
    elif self.type == "team-slave":
        if self.mtu is not None:
            cmd = self.create_connection_team_slave()
            self.execute_command(cmd)
            cmd = self.modify_connection_team_slave()
            self.execute_command(cmd)
            # cmd=self.up_connection()
        else:
            cmd = self.create_connection_team_slave()
    elif self.type == "bond":
        if (self.mtu is not None) or (self.dns4 is not None) or (self.dns6 is not None):
            cmd = self.create_connection_bond()
            self.execute_command(cmd)
            cmd = self.modify_connection_bond()
            self.execute_command(cmd)
            cmd = self.up_connection()
        else:
            cmd = self.create_connection_bond()
    elif self.type == "bond-slave":
        cmd = self.create_connection_bond_slave()
    elif self.type == "ethernet":
        if (self.mtu is not None) or (self.dns4 is not None) or (self.dns6 is not None):
            cmd = self.create_connection_ethernet()
            self.execute_command(cmd)
            cmd = self.modify_connection_ethernet()
            self.execute_command(cmd)
            cmd = self.up_connection()
        else:
            cmd = self.create_connection_ethernet()
    elif self.type == "bridge":
        cmd = self.create_connection_bridge()
    elif self.type == "vlan":
        cmd = self.create_connection_vlan()

    if cmd:
        return self.execute_command(cmd)
    else:
        self.module.fail_json(
            msg="Type of device or network connection is required "
            "while performing 'create' operation. Please specify 'type' as an argument."
        )