[issue5800] make wsgiref.headers.Headers accept empty constructor

[Pablo Torres Navarrete]

Pablo Torres Navarrete <tn.pablo at gmail.com> added the comment:

Patch attached.  While I was at it, I also removed stupid whitespace and 
generally made the module more PEP8-compliant.

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nosy: +ptn
Added file: http://bugs.python.org/file14311/patch

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