Review Request 175: Handle exception in python 3 version of argparse

[Stephen Gallagher]

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http://reviewboard-fedoraserver.rhcloud.com/r/175/
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Review request for RoleKit Mailing List, Miloslav Trmac, Nils Philippsen, Stephen
Gallagher, and Thomas Woerner.


Repository: rolekit


Description
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Fixes https://github.com/libre-server/rolekit/issues/27


Diffs
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  src/rolectl dd2d41cd6d5086d61ee056e9a6b99d84fb605185 

Diff: http://reviewboard-fedoraserver.rhcloud.com/r/175/diff/


Testing
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Thanks,

Stephen Gallagher