[issue14726] Lib/email/*.py use an EMPTYSTRING global instead of ''

[R. David Murray]

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

I've always wondered why the code did that.  If Barry doesn't have a good reason for it, I'll refactor it at some point.

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assignee:  -> r.david.murray
nosy: +barry, r.david.murray
type:  -> performance

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<http://bugs.python.org/issue14726>
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