Author: Jonathon Fowler
MDL-38390 qformat_blackboard_six: use pool title as category name
If the category title is empty, generate a sequentially-numbered
title to use instead.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8bcefa699df3a8a8792112f4123a4649a037f346
http://github.com/moodle/moodle/commit/8bcefa699df3a8a8792112f4123a4649a037f346
+ 2.5 en [importedcategory,qformat_blackboard_six]