Author: Andrew Nicols
MDL-61407 qtype: Add null_writer for all qtypes
http://git.moodle.org/gw?p=moodle.git;a=commit;h=52dd3facb56786094f01d09ab9fa2837da2e30da
http://github.com/moodle/moodle/commit/52dd3facb56786094f01d09ab9fa2837da2e30da
+ 3.4 en [privacy:metadata,qtype_calculated]
+ 3.4 en [privacy:metadata,qtype_calculatedmulti]
+ 3.4 en [privacy:metadata,qtype_calculatedsimple]
+ 3.4 en [privacy:metadata,qtype_ddimageortext]
+ 3.4 en [privacy:metadata,qtype_ddmarker]
+ 3.4 en [privacy:metadata,qtype_ddwtos]
+ 3.4 en [privacy:metadata,qtype_description]
+ 3.4 en [privacy:metadata,qtype_essay]
+ 3.4 en [privacy:metadata,qtype_gapselect]
+ 3.4 en [privacy:metadata,qtype_match]
+ 3.4 en [privacy:metadata,qtype_missingtype]
+ 3.4 en [privacy:metadata,qtype_multianswer]
+ 3.4 en [privacy:metadata,qtype_multichoice]
+ 3.4 en [privacy:metadata,qtype_numerical]
+ 3.4 en [privacy:metadata,qtype_random]
+ 3.4 en [privacy:metadata,qtype_randomsamatch]
+ 3.4 en [privacy:metadata,qtype_shortanswer]
+ 3.4 en [privacy:metadata,qtype_truefalse]