Description of problem:

I get an AttributeError when running rpmdeplint without arguments.

Version-Release number of selected component (if applicable):
1.2

How reproducible:
100%

Steps to Reproduce:
1. Run: rpmdeplint without arguments

Actual results:

Traceback (most recent call last):
  File "/usr/bin/rpmdeplint", line 9, in <module>
    load_entry_point('rpmdeplint==1.2', 'console_scripts', 'rpmdeplint')()
  File "/usr/lib/python3.5/site-packages/rpmdeplint/cli.py", line 220, in main
    return args.func(args)
AttributeError: 'Namespace' object has no attribute 'func'


Expected results:
usage: rpmdeplint [-h] [--debug] [--version]
                  {check,check-sat,check-repoclosure,check-conflicts,check-upgrade,list-deps}
                  ...
rpmdeplint: error: too few arguments

Additional info:

packages installed: python3-rpmdeplint, rpmdeplint