[3.12] gh-118643: Fix AttributeError in the email module (GH-119099)#119390
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Fix regression introduced in gh-100884: AttributeError when re-fold a long
address list.
Also fix more cases of incorrect encoding of the address separator in the
address list missed in gh-100884.
(cherry picked from commit 858b9e8)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com