[issue12639] msilib Directory.start_component() fails if keyfile is not None

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

Thanks, Zackery!

The backports are running CI now and should merge if everything passes.

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stage: patch review -> backport needed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue12639>
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