Author: Tim Hunt
MDL-30559 conditional availability: missing validation of grade rules.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=af4e440888f26bb58b4aec2269d10c3028f74146
http://github.com/moodle/moodle/commit/af4e440888f26bb58b4aec2269d10c3028f74146
+ 2.3 en [badgradelimits,core_condition]
+ 2.3 en [gradeitembutnolimits,core_condition]
+ 2.3 en [gradelimitsbutnoitem,core_condition]
+ 2.3 en [gradesmustbenumeric,core_condition]