[3.9] bpo-19460: Add test for MIMENonMultipart (GH-29817)#29819

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asvetlov merged 2 commits intopython:3.9from

miss-islington:backport-46c8d91-3.9

Nov 28, 2021

Commits on Nov 28, 2021

bpo-19460: Add test for MIMENonMultipart (GH-29817)

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Update 2021-11-28-15-25-02.bpo-19460.lr0aWs.rst
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