Fix vulnerability in handling _session argument of utils/save-prefs (#1489382)

Aleksander Machniak

2013-10-17 037af6890fe6fdb84a08d3c86083e847c90ec0ad

 program/steps/mail/move_del.inc

@@ -73,6 +73,8 @@
}
// unknown action or missing query param
else {
    $OUTPUT->show_message('internalerror', 'error');
    $OUTPUT->send();
    exit;
}