Author: Zig Tan
MDL-61881 report_eventlist: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7b78c329c5ba603e27a926ba480cebb326db13e4
http://github.com/moodle/moodle/commit/7b78c329c5ba603e27a926ba480cebb326db13e4
+ 3.5 en [privacy:metadata,report_eventlist]