# Buggy code
def __init__(self, module):
    self.module = module
    self.state = module.params["state"]
    self.autoconnect = module.params["autoconnect"]
    self.conn_name = module.params["conn_name"]
    self.master = module.params["master"]
    self.ifname = module.params["ifname"]
    self.type = module.params["type"]
    self.ip4 = module.params["ip4"]
    self.gw4 = module.params["gw4"]
    self.dns4 = " ".join(module.params["dns4"]) if module.params.get("dns4") else None
    self.ip6 = module.params["ip6"]
    self.gw6 = module.params["gw6"]
    self.dns6 = module.params["dns6"]
    self.mtu = module.params["mtu"]
    self.stp = module.params["stp"]
    self.priority = module.params["priority"]
    self.mode = module.params["mode"]
    self.miimon = module.params["miimon"]
    self.downdelay = module.params["downdelay"]
    self.updelay = module.params["updelay"]
    self.arp_interval = module.params["arp_interval"]
    self.arp_ip_target = module.params["arp_ip_target"]
    self.slavepriority = module.params["slavepriority"]
    self.forwarddelay = module.params["forwarddelay"]
    self.hellotime = module.params["hellotime"]
    self.maxage = module.params["maxage"]
    self.ageingtime = module.params["ageingtime"]
    self.mac = module.params["mac"]
    self.vlanid = module.params["vlanid"]
    self.vlandev = module.params["vlandev"]
    self.flags = module.params["flags"]
    self.ingress = module.params["ingress"]
    self.egress = module.params["egress"]


# 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 __init__(self, module):
    self.module = module
    self.state = module.params["state"]
    self.autoconnect = module.params["autoconnect"]
    self.conn_name = module.params["conn_name"]
    self.master = module.params["master"]
    self.ifname = module.params["ifname"]
    self.type = module.params["type"]
    self.ip4 = module.params["ip4"]
    self.gw4 = module.params["gw4"]
    self.dns4 = " ".join(module.params["dns4"]) if module.params.get("dns4") else None
    self.ip6 = module.params["ip6"]
    self.gw6 = module.params["gw6"]
    self.dns6 = module.params["dns6"]
    self.mtu = module.params["mtu"]
    self.stp = module.params["stp"]
    self.priority = module.params["priority"]
    self.mode = module.params["mode"]
    self.miimon = module.params["miimon"]
    self.downdelay = module.params["downdelay"]
    self.updelay = module.params["updelay"]
    self.arp_interval = module.params["arp_interval"]
    self.arp_ip_target = module.params["arp_ip_target"]
    self.slavepriority = module.params["slavepriority"]
    self.forwarddelay = module.params["forwarddelay"]
    self.hellotime = module.params["hellotime"]
    self.maxage = module.params["maxage"]
    self.ageingtime = module.params["ageingtime"]
    self.mac = module.params["mac"]
    self.vlanid = module.params["vlanid"]
    self.vlandev = module.params["vlandev"]
    self.flags = module.params["flags"]
    self.ingress = module.params["ingress"]
    self.egress = module.params["egress"]
    self.nmcli_bin = self.module.get_bin_path("nmcli", True)