[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 ef5bb25e2d6147cd44be9c9b166525fb30485be0 by R. David Murray (Batuhan Taşkaya) in branch 'master':
bpo-27737: Allow whitespace only headers encoding (#13478)
https://github.com/python/cpython/commit/ef5bb25e2d6147cd44be9c9b166525fb30485be0


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