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

[Berker Peksag]

Change by Berker Peksag <berker.peksag at gmail.com>:


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pull_requests: +4473
stage: needs patch -> patch review

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