[issue17369] Message.get_filename produces exception if the RFC2231 encoding is ill-formed

[Matt]

Changes by Matt <webforms+python at mjharrigan.com>:


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components: +Library (Lib) -email
versions: +Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17369>
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