Author: Zig Tan
MDL-61568 repository_url: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8338bf65936e7b4e877f8d3b63312f21663430df
http://github.com/moodle/moodle/commit/8338bf65936e7b4e877f8d3b63312f21663430df
+ 3.4 en [privacy:metadata,repository_url]