Author: Stevani Andolo
MDL-77829 core: Added environment check for mod_assignment
Decided to add an environment check before uninstalling the
mod_assignment plugin to prevent data lost.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=83aa818f0812eeb2c157a4cca4b18bab75926483
http://github.com/moodle/moodle/commit/83aa818f0812eeb2c157a4cca4b18bab75926483
+ 3.11 en [modassignmentinuse,core_admin]