[issue1140] re.sub returns str when processing empty unicode string

[Guido van Rossum]

Guido van Rossum added the comment:

Actually, it already implements the best possible rules, *except* for
the special case of an empty 3rd argument.  (When there are no
substitutions, it normally returns the input unchanged; but somehow an
empty input is handled with a shortcut even before that point.  It ought
to be a simlpe fix.

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