Author: Zig Tan
MDL-61568 repository_equella: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=fe9954ef1f6945502dd178f8ae782cf320e07cc5
http://github.com/moodle/moodle/commit/fe9954ef1f6945502dd178f8ae782cf320e07cc5
+ 3.3 en [privacy:metadata,repository_equella]