Author: David Monllao
MDL-62218 mlbackend: Null privacy providers for core mlbackends
http://git.moodle.org/gw?p=moodle.git;a=commit;h=cee06411b5c75a29ba51c6fa3dc49146b6f56d72
http://github.com/moodle/moodle/commit/cee06411b5c75a29ba51c6fa3dc49146b6f56d72
+ 3.5 en [privacy:metadata,mlbackend_php]
+ 3.5 en [privacy:metadata,mlbackend_python]