[issue34800] email.contentmanager raises error when policy.max_line_length==None or 0

[silane]

silane <michiwatsuki at gmail.com> added the comment:

I've made a pull request.
Please look at it.
And this is my first pull request, so please let me know if something wrong.

https://github.com/python/cpython/pull/9578

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<https://bugs.python.org/issue34800>
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