Author: Amaia Anabitarte
MDL-69672 core_contentbank: Check used context level
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a9bccc9dbcd209809e471c25413723975c2d75db
http://github.com/moodle/moodle/commit/a9bccc9dbcd209809e471c25413723975c2d75db
+ 3.9 en [contextnotallowed,core_contentbank]