[issue9874] Message.attach() loses empty attachments

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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versions: +Python 2.7, Python 3.1, Python 3.2 -Python 2.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9874>
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