[issue27321] Email parser creates a message object that can't be flattened

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset 371146a3f8a989964e2a9c0efc7d776815410fac by Miss Skeleton (bot) in branch '3.8':
bpo-27321 Fix email.generator.py to not replace a non-existent header. (GH-18074)
https://github.com/python/cpython/commit/371146a3f8a989964e2a9c0efc7d776815410fac


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<https://bugs.python.org/issue27321>
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