[issue13399] Don't print traceback for unrecognized actions, commands and options in packaging

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 7d4098ce0087 by Éric Araujo in branch 'default':
Tighten tests for #13399
http://hg.python.org/distutils2/rev/7d4098ce0087

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<http://bugs.python.org/issue13399>
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