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=9d1d7caf543648190e67d65e65bcd1a92dcfcd8a
http://github.com/moodle/moodle/commit/9d1d7caf543648190e67d65e65bcd1a92dcfcd8a
+ 3.4 en [privacy:metadata,assignment_offline]
+ 3.4 en [privacy:metadata,assignment_online]
+ 3.4 en [privacy:metadata,assignment_upload]
+ 3.4 en [privacy:metadata,assignment_uploadsingle]