added error check to getTopicDataWithUser

src/topics.js

@@ -325,13 +325,13 @@ var async = require('async'),
 
 	Topics.getTopicDataWithUser = function(tid, callback) {
 		Topics.getTopicData(tid, function(err, topic) {
-			if(err) {
-				return callback(err, null);
+			if(err || !topic) {
+				return callback(err || new Error('topic doesn\'t exist'));
 			}
 
 			user.getUserFields(topic.uid, ['username', 'userslug', 'picture'] , function(err, userData) {
 				if(err) {
-					return callback(err, null);
+					return callback(err);
 				}
 
 				topic.username = userData.username;
@@ -859,11 +859,7 @@ var async = require('async'),
 		}
 
 		function getReadStatus(next) {
-			if (uid && parseInt(uid, 10) > 0) {
-				Topics.hasReadTopic(tid, uid, next);
-			} else {
-				next(null, null);
-			}
+			Topics.hasReadTopic(tid, uid, next);
 		}
 
 		function getTeaser(next) {