bpo-33524: Fix the folding of email header when max_line_length is 0 or None (GH-13391)


and there are non-ascii characters in the header.
(cherry picked from commit feac6cd7753425fba006e97e2d9b74a0c0c75894)

Co-authored-by: Abhilash Raj <maxking@users.noreply.github.com>
4 files changed