Author: Zig Tan
MDL-61881 report_stats: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=74091994117653a2d09459c82bb4c929c9a00449
http://github.com/moodle/moodle/commit/74091994117653a2d09459c82bb4c929c9a00449
+ 3.4 en [privacy:metadata,report_stats]