Author: Zig Tan
MDL-61568 repository_equella: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e9ff078d75bbb8a5dc43536654b2db426266209e
http://github.com/moodle/moodle/commit/e9ff078d75bbb8a5dc43536654b2db426266209e
+ 3.5 en [privacy:metadata,repository_equella]