Author: Zig Tan
MDL-61567 mod_url: Implement null provider mod_url
http://git.moodle.org/gw?p=moodle.git;a=commit;h=362a7ed6fe8bbd28a88c7c2ea25b87ddb9a9ae27
http://github.com/moodle/moodle/commit/362a7ed6fe8bbd28a88c7c2ea25b87ddb9a9ae27
+ 3.4 en [privacy:metadata,mod_url]