Author: Zig Tan
MDL-61568 repository_url: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=05c15ed93122ebbb9d879a2ed405c2f557615106
http://github.com/moodle/moodle/commit/05c15ed93122ebbb9d879a2ed405c2f557615106
+ 3.5 en [privacy:metadata,repository_url]