[issue27737] email.header.Header.encode() crashes with IndexError on spaces only value

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:


New changeset 0416d6f05a96e0f1b3751aa97abfffe6d3323976 by R. David Murray (Miss Islington (bot)) in branch '3.7':
bpo-27737: Allow whitespace only headers encoding (GH-13478) (#13517)
https://github.com/python/cpython/commit/0416d6f05a96e0f1b3751aa97abfffe6d3323976


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<https://bugs.python.org/issue27737>
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