Author: Zig Tan
MDL-61567 mod_url: Implement null provider mod_url
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2377dbd9d81d42f468512311caf8707bd462e67c
http://github.com/moodle/moodle/commit/2377dbd9d81d42f468512311caf8707bd462e67c
+ 3.3 en [privacy:metadata,mod_url]