Author: Mihail Geshoski
MDL-61918 assignment: Implement null privacy provider
Implement null privacy provider to offline, online, upload and uploadsingle assignment plugins.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=fbf8d40f9814212c12381102168b8c467a654a4f
http://github.com/moodle/moodle/commit/fbf8d40f9814212c12381102168b8c467a654a4f
+ 3.3 en [privacy:metadata,assignment_offline]
+ 3.3 en [privacy:metadata,assignment_online]
+ 3.3 en [privacy:metadata,assignment_upload]
+ 3.3 en [privacy:metadata,assignment_uploadsingle]