[issue5423] Exception raised when attempting to call set_charset on an email.mime.multipart once sub-parts have been attached

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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priority:  -> normal
stage: test needed -> patch review
versions: +Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5423>
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