[issue12239] msilib VT_EMPTY SummaryInformation properties raise an error (suggest returning None)

[Brian Curtin]

Changes by Brian Curtin <brian at python.org>:


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stage:  -> needs patch
type:  -> behavior
versions: +Python 2.7, Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12239>
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