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

[Mark Lawrence]

Changes by Mark Lawrence <breamoreboy at yahoo.co.uk>:


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nosy: +loewis, steve.dower
versions: +Python 3.5 -Python 2.6, Python 2.7, Python 3.1, Python 3.2, Python 3.3

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