Author: Zig Tan
MDL-61568 repository_user: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e196d3178912c98b7c0c7ea627a6eb7bd38d451c
http://github.com/moodle/moodle/commit/e196d3178912c98b7c0c7ea627a6eb7bd38d451c
+ 3.5 en [privacy:metadata,repository_user]