Hello !

Description of problem:

If I launch dnf in commandline with any option (even nothing) I got this error on my terminal :

Traceback (most recent call last):
  File "/usr/bin/dnf", line 57, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python3.4/site-packages/dnf/cli/main.py", line 174, in user_main
    errcode = main(args)
  File "/usr/lib/python3.4/site-packages/dnf/cli/main.py", line 60, in main
    return _main(base, args)
  File "/usr/lib/python3.4/site-packages/dnf/cli/main.py", line 93, in _main
    cli.configure(map(ucd, args))
  File "/usr/lib/python3.4/site-packages/dnf/cli/cli.py", line 928, in configure
    opts, cmds = self.optparser.parse_known_args(args)
  File "/usr/lib/python3.4/site-packages/argparse-1.1-py3.4.egg/argparse.py", line 1754, in parse_known_args
    for dest in self._defaults:
  File "/usr/lib/python3.4/site-packages/argparse-1.1-py3.4.egg/argparse.py", line 1966, in _parse_known_args
    start_index = consume_optional(start_index)
TypeError: 'map' object is not subscriptable

and in systemd logs I got an error this error :

Message : Failed to start dnf makecache. 
Priority : 3
Subject : Unit dnf-makecache.service has failed 

Version-Release number of selected component (if applicable):

I can really say because I can't do "dnf --version" but I have a up-to-date system. 

How reproducible:

I don't really know how I got this bug in the first place so I don't know how to recreate it. Sorry guys.

Steps to Reproduce:
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Actual results:



Expected results:


Additional info:


I hope it's enough. It's my first bug report.

Thank a lot !