Author: David Monllao
MDL-62218 mlbackend: Null privacy providers for core mlbackends
http://git.moodle.org/gw?p=moodle.git;a=commit;h=eb5bcca5ad4def8269290f1e73102f0808ce5ef9
http://github.com/moodle/moodle/commit/eb5bcca5ad4def8269290f1e73102f0808ce5ef9
+ 3.4 en [privacy:metadata,mlbackend_php]
+ 3.4 en [privacy:metadata,mlbackend_python]