[issue10515] csv sniffer does not recognize quotes at the end of line

[R. David Murray]

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

Yeah, obviously wrong.  I forgot to finish editing the comment.

I think a fallback of ',' makes more sense than ''.  What would a delimiter of nothing mean?  I don't think the unquoted case can be changed for backward compatibility reasons, so those tests I added should presumably be changed to confirm the existing behavior (with an appropriate comment).

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<http://bugs.python.org/issue10515>
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