Author: Tim Hunt
MDL-30559 conditional availability: missing validation of grade rules.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ac9ee6a834b7c01eb87789d9694a9f917fc4f0b0
http://github.com/moodle/moodle/commit/ac9ee6a834b7c01eb87789d9694a9f917fc4f0b0
+ 2.0 en [badgradelimits,core_condition]
+ 2.0 en [gradeitembutnolimits,core_condition]
+ 2.0 en [gradelimitsbutnoitem,core_condition]
+ 2.0 en [gradesmustbenumeric,core_condition]