Author: Zig Tan
MDL-61881 report_eventlist: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6b39e44679b1cf65fb29316993f3cc0256cf3ddc
http://github.com/moodle/moodle/commit/6b39e44679b1cf65fb29316993f3cc0256cf3ddc
+ 3.4 en [privacy:metadata,report_eventlist]