Fix a bug in svn patch which prevented empty lines of context from matching.
Fix a bug in svn patch which prevented empty lines of context from matching.

* subversion/libsvn_client/patch.c
  (match_hunk): Some time ago, lines read from a hunk used to include
   the leading '-', ' ', or '+' character. But nowadays the diff-parser
   abstracts those away for us, so it's fine if a line read from a hunk
   has length zero.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion