Check for the existence of the blame chunks, not just the chain itself before normalizing original and merged blame chains.  Followup to r26211.
Check for the existence of the blame chunks, not just the chain itself
before normalizing original and merged blame chains.  Followup to r26211.

* subversion/libsvn_client/blame.c
  (svn_client_blame4): Create blame chunks for the orginal blame chain if
  none exist.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@866305 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion