Author: Zig Tan
MDL-61568 repository_webdav: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=cbee83840f1f9c9aa975f30ea24057555df8148c
http://github.com/moodle/moodle/commit/cbee83840f1f9c9aa975f30ea24057555df8148c
+ 3.5 en [privacy:metadata,repository_webdav]