Author: Tim Hunt
MDL-30559 conditional availability: missing validation of grade rules.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=26ebc4170344ab7090142a4ae5f343b3e5348862
http://github.com/moodle/moodle/commit/26ebc4170344ab7090142a4ae5f343b3e5348862
+ 2.2 en [badgradelimits,core_condition]
+ 2.2 en [gradeitembutnolimits,core_condition]
+ 2.2 en [gradelimitsbutnoitem,core_condition]
+ 2.2 en [gradesmustbenumeric,core_condition]