[MERGE] wsgi.RelpathSetter header fix

[John Arbash Meinel]

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Matt Nordhoff sent me this patch which is a small fix for our wsgi code.
He sent me this update because he wasn't happy with the commit message.

It seems when there is a bad request, we were returning an empty
dictionary of headers, when it is supposed to be an empty list.

I'm happy with the patch, can I get another review?

John
=:->

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