Follow up r37355.
Follow up r37355.

* subversion/libsvn_wc/props.c
  (svn_wc__internal_propget): Avoid potential segfault since 'prophash'
   may be NULL.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@877582 13f79535-47bb-0310-9956-ffa450edef68

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