Author: Zig Tan
MDL-61881 report_log: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=701554737136dbf87ce108afdac4e4264f31f824
http://github.com/moodle/moodle/commit/701554737136dbf87ce108afdac4e4264f31f824
+ 3.4 en [privacy:metadata,report_log]