Author: Zig Tan
MDL-61881 report_outline: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=31b0b0202593f6204967fc6ea101f896f52a13a0
http://github.com/moodle/moodle/commit/31b0b0202593f6204967fc6ea101f896f52a13a0
+ 3.3 en [privacy:metadata,report_outline]