Merge r644050 from trunk:

* Prevent a segfault if the destination URI of a copy / move operation is
  not under DAV control. Return 405 (Method not allowed) instead.

PR: 44734

Submitted by: rpluem
Reviewed by: rpluem, niq, trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@660571 13f79535-47bb-0310-9956-ffa450edef68