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

[SilentGhost]

SilentGhost <michael.mischurow+bpo at gmail.com> added the comment:

Re-submitting the patch for Lib/wsgiref/headers.py w/o the isinstance change

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keywords: +patch
Added file: http://bugs.python.org/file19797/headers.py.diff

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