Fix issue 1655, "svn blame returns nothing if selected revision is too new".
Fix issue 1655, "svn blame returns nothing if selected revision is too new".

* subversion/libsvn_client/blame.c:
  (svn_client_blame): Handle the no-log-messages received case by assigning
   no blame to the fulltext at end_revision.

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