[issue7677] distutils, better error message for setup.py upload -sign without identity.

[Brian Curtin]

Changes by Brian Curtin <curtin at acm.org>:


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priority:  -> normal
stage:  -> needs patch
versions: +Python 2.6, Python 2.7, Python 3.1, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7677>
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