Author: Amaia Anabitarte
MDL-69089 core_contentbank: Empty content names are not allowed
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5ea98dc5b1086ddbc6f9be5899063f21adaae370
http://github.com/moodle/moodle/commit/5ea98dc5b1086ddbc6f9be5899063f21adaae370
+ 4.0 en [emptynamenotallowed,core_contentbank]