Fixed realtime cleaner, socket should defined and notename is not a necessary in disconnect

Author: jackycute

lib/realtime.js

@@ -107,7 +107,7 @@ var updater = setInterval(function () {
 var cleaner = setInterval(function () {
     async.each(Object.keys(users), function (key, callback) {
         var socket = realtime.io.sockets.connected[key];
-        if (!socket || !socket.rooms || socket.rooms.length <= 0) {
+        if (socket && (!socket.rooms || socket.rooms.length <= 0)) {
             if (config.debug)
                 logger.info("cleaner found redundant user: " + key);
             disconnectSocketQueue.push(socket);
@@ -353,14 +353,11 @@ function disconnect(socket) {
         logger.info("SERVER disconnected a client");
         logger.info(JSON.stringify(users[socket.id]));
     }
-    var notename = getNotenameFromSocket(socket);
-    if (!notename) {
-		isDisconnectBusy = false;
-		return;
-	}
+	
     if (users[socket.id]) {
         delete users[socket.id];
     }
+	var notename = getNotenameFromSocket(socket);
     var note = notes[notename];
     if (note) {
         delete note.users[socket.id];