Author: Zig Tan
MDL-61881 report_outline: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c1a8f55b86cc090c5e62f5fb4df099a8c08d88a2
http://github.com/moodle/moodle/commit/c1a8f55b86cc090c5e62f5fb4df099a8c08d88a2
+ 3.5 en [privacy:metadata,report_outline]