Merge pull request #546 from bundabrg/fix/null-color

When a color can't be translated set to NONE instead of null

src/main/java/com/github/steveice10/mc/protocol/data/message/ChatColor.java

@@ -28,7 +28,7 @@ public enum ChatColor {
             }
         }
 
-        return null;
+        return ChatColor.NONE;
     }
 
     @Override