[3.14] gh-135307: Fix email error when policy max_line_length is set to 0 or None (GH-135367) #140915
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(cherry picked from commit 6d45cd8)
Co-authored-by: Jiucheng(Oliver) git.jiucheng@gmail.com
RDM: Like the change made in a earlier PR to the folder, we can/must use 'maxlen' as a stand in for 'unlimited' when computing line lengths when max_line_length is 0 or None; otherwise the computation results in a traceback.
email.policy.Policy.max_line_lengthis falsey #135307