[issue27397] email.message.Message.get_payload(decode=True) raises AssertionError that "should never happen"

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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pull_requests: +7279

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue27397>
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