Only create a target stream for a property if the property exists.
Only create a target stream for a property if the property exists.

* subversion/libsvn_client/patch.c
  (init_prop_content_info): Only create a target stream if the property
    exists.
  (apply_one_patch): Check that the target stream is not NULL before
    closing it.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@966192 13f79535-47bb-0310-9956-ffa450edef68

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