Merge r1453780 from trunk:

 * r1453780
   Reject operations on some properties for activity resources.
   Justification:
     It's a SEGV.
   Votes:
     +1: philip, breser, stefan2


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.6.x@1461943 13f79535-47bb-0310-9956-ffa450edef68