Tiny wcprops optimization.
Tiny wcprops optimization.

* subversion/libsvn_wc/props.c
  (svn_wc__wcprops_write): Avoid writing empty all-wcprops files (remove
  instead if writing a directory with no props) and avoid storing empty
  proplists.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@859511 13f79535-47bb-0310-9956-ffa450edef68

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