Author: Sam Hemelryk
MDL-31763 mod_data: Fixed array iteration reference issue
http://git.moodle.org/gw?p=moodle.git;a=commit;h=d3da2883ce9ed16549fcdf6e47b2675b16705a0d
http://github.com/moodle/moodle/commit/d3da2883ce9ed16549fcdf6e47b2675b16705a0d
+ 2.1 en [cannotoverwritepreset,mod_data]