[issue30835] AttributeError when parsing multipart email with invalid non-decodable Content-Transfer-Encoding

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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stage:  -> test needed
versions: +Python 3.8 -Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30835>
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