Author: Juan Leyva
MDL-72143 airnotifier: Additional configuration check
Additional check for $CFG->noemailever
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1f5ceda78e966283b1c47d0bdb9bd26eb7a7da30
http://github.com/moodle/moodle/commit/1f5ceda78e966283b1c47d0bdb9bd26eb7a7da30
+ 4.0 en [noemailevernotset,message_airnotifier]
+ 4.0 en [noemaileverset,message_airnotifier]