paste.util.mimeparse:best_match exception when weighted_matches is empty

[pedersen]

 http://bitbucket.org/ianb/paste/src/tip/paste/util/mimeparse.py

Last line of this file has a problem. If weighted_matches is empty, an exception is generated.

Suggested fix is to change to this:

try:

return weighted_matches[-1][0][1] and weighted_matches[-1][1]

except:

return

[ianb]

I think the update to mimeparse either fixed or invalidated this