fixes error alerts if scroll is triggered during transitions

public/src/forum/popular.js

@@ -21,6 +21,10 @@ define(['forum/recent'], function(recent) {
 		});
 
 		function loadMoreTopics() {
+			if(!$('#topics-container').length) {
+				return;
+			}
+
 			loadingMoreTopics = true;
 			socket.emit('topics.loadMoreFromSet', {
 				set: 'topics:' + $('.nav-pills .active a').html().toLowerCase(),

public/src/forum/recent.js

@@ -92,6 +92,10 @@ define(function() {
 	}
 
 	Recent.loadMoreTopics = function() {
+		if(!$('#topics-container').length) {
+			return;
+		}
+
 		loadingMoreTopics = true;
 		socket.emit('topics.loadMoreRecentTopics', {
 			after: $('#topics-container').attr('data-nextstart'),

public/src/forum/unread.js

@@ -44,6 +44,9 @@ define(['forum/recent'], function(recent) {
 		});
 
 		function loadMoreTopics() {
+			if(!$('#topics-container').length) {
+				return;
+			}
 			loadingMoreTopics = true;
 			socket.emit('topics.loadMoreUnreadTopics', {
 				after: $('#topics-container').attr('data-nextstart')