Merge branch 'fix-sending-message-to-null-user' into 'ms4/dev'

Fix for function sending data to a user that has left #1807

See merge request morningstar/Arcturus-Community!46

src/main/java/com/eu/habbo/habbohotel/rooms/Room.java

@@ -3318,6 +3318,7 @@ public class Room implements Comparable<Room>, ISerialize, Runnable {
         }
 
         for (Habbo habbo : this.getHabbos()) {
+            if (habbo == null) { return ; }
             if (!habbo.getHabboStats().isIgnoreBots())
                 habbo.getClient().sendResponse(message);
         }