[PHPBB3-12572] JavaScript console throws error when alert message title is not defined (core.js bug)

Details

if (typeof res.MESSAGE_TITLE !== 'undefined') {

	alert = phpbb.alert(res.MESSAGE_TITLE, res.MESSAGE_TEXT);

} else {

	dark.fadeOut(phpbb.alertTime);

On lines 333-337 the code is to hide alert on page refresh but there's no check if alert is undefined:

// Hide the alert even if we refresh the page, in case the user

// presses the back button.

dark.fadeOut(phpbb.alertTime, function() {

	alert.hide();

});

Thus, if 'MESSAGE_TITLE' is not defined, JS console (Firebug/etc) throws error on page refresh:

TypeError: alert is undefined

alert.hide()