Following up on r1102912, also enable file external propery handling on propget and don't add uninitialized errors in a chain.
Following up on r1102912, also enable file external propery handling on
propget and don't add uninitialized errors in a chain.

* subversion/libsvn_client/prop_commands.c
  (svn_client_propget3): Handle file externals as explicit target.
  (svn_client_proplist3): Reduce scope of err. Fix indentation. Don't
    pass an uninitialized err to svn_error_createf.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1102915 13f79535-47bb-0310-9956-ffa450edef68

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