[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 478700dd4f6c by Patrice Gauthier in branch 'default':
#13399: Fixes the invalid arguments handling
http://hg.python.org/distutils2/rev/478700dd4f6c

New changeset fcfa635db609 by Patrice Gauthier in branch 'default':
#13399 - some tweaking
http://hg.python.org/distutils2/rev/fcfa635db609

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nosy: +python-dev

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