fix a crash that occurs when a directory that has been manually deleted  by the user is copied via svn copy.
fix a crash that occurs when a directory that has been manually deleted 
by the user is copied via svn copy.

* subversion/libsvn_client/copy.c
  (setup_copy): don't pass a NULL url on to the rest of the copy code, 
  instead error out with SVN_ERR_ENTRY_MISSING_URL.  the NULL url will 
  just cause a crash later on, so returning an error seems safest.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@848937 13f79535-47bb-0310-9956-ffa450edef68

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