Author: Zig Tan
MDL-61567 mod_folder: Implement null provider mod_folder
http://git.moodle.org/gw?p=moodle.git;a=commit;h=804e7a614206e4426b1da879a75e7a6f454dcd5e
http://github.com/moodle/moodle/commit/804e7a614206e4426b1da879a75e7a6f454dcd5e
+ 3.4 en [privacy:metadata,mod_folder]