policycoreutils: improve sepolicy command line interface

Previously, when sepolicy was run without any argument, the usage message
with the error "too few arguments" was shown. Using Python 3 it threw a traceback.
This patch unifies behavior on Py2 and Py3 so that sepolicy shows the help
message in this case.

Fixes:
Traceback (most recent call last):
  File "/usr/bin/sepolicy", line 647, in <module>
    args.func(args)
AttributeError: 'Namespace' object has no attribute 'func'

Signed-off-by: Petr Lautrbach <[email protected]>
1 file changed