Author: Zig Tan
MDL-61567 mod_resource: Implement null provider mod_resource
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f318b80a0f5aaa81721af1aaef3732c265ba6069
http://github.com/moodle/moodle/commit/f318b80a0f5aaa81721af1aaef3732c265ba6069
+ 3.5 en [privacy:metadata,mod_resource]