[issue40837] email.utils.encode_rfc2231(string, None, None) returns broken value

[Senthil Kumaran]

Change by Senthil Kumaran <senthil at uthcode.com>:


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versions: +Python 3.10 -Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40837>
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