On the 'fs-rep-sharing' branch, avoid deferencing a NULL value.
On the 'fs-rep-sharing' branch, avoid deferencing a NULL value.

* subversion/libsvn_fs_base/dag.c
  (svn_fs_base__dag_set_proplist): Don't delete the rep whose key ain't.


git-svn-id: b8cc343a69b1f0cbd825b978e2a42c89704f90e3@869081 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion