js: fix check for active chat

panikweb_templates/static/js/specifics.js

@@ -220,7 +220,7 @@ $(function() {
 			else {
 				onairContainer = $('<span>Unknown (Probably Non-Stop)</span>');
 			}
-			if (onair.data.emission.chat) {
+			if (onair.data.emission && onair.data.emission.chat) {
 				$('#CurrentlyChatting a').attr('href', onair.data.emission.chat);
 				$('#CurrentlyChatting').show();
 			} else {