reset search on tags page if input is empty

public/src/client/tags.js

@@ -16,7 +16,7 @@ define('forum/tags', ['forum/infinitescroll'], function(infinitescroll) {
 			}
 
 			if (!$('#tag-search').val().length) {
-				return;
+				return resetSearch();
 			}
 
 			timeoutId = setTimeout(function() {
@@ -51,6 +51,17 @@ define('forum/tags', ['forum/infinitescroll'], function(infinitescroll) {
 		});
 	};
 
+	function resetSearch() {
+		socket.emit('topics.loadMoreTags', {
+			after: 0
+		}, function(err, data) {
+			if (err) {
+				return app.alertError(err.message);
+			}
+			onTagsLoaded(data.tags, true);
+		});
+	}
+
 	function onTagsLoaded(tags, replace, callback) {
 		callback = callback || function() {};
 		infinitescroll.parseAndTranslate('tags', 'tags', {tags: tags}, function(html) {

src/socket.io/topics.js

@@ -556,7 +556,7 @@ SocketTopics.searchAndLoadTags = function(socket, data, callback) {
 };
 
 SocketTopics.loadMoreTags = function(socket, data, callback) {
-	if(!data || !data.after) {
+	if(!data || !utils.isNumber(data.after)) {
 		return callback(new Error('[[error:invalid-data]]'));
 	}