Author: Zig Tan
MDL-61881 report_courseoverview: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bb491841162d260e37704c84268cdca4cc140e58
http://github.com/moodle/moodle/commit/bb491841162d260e37704c84268cdca4cc140e58
+ 3.4 en [privacy:metadata,report_courseoverview]