Resizing after connection lost leads to exception spam

[T1mmos]

When the server closes, the client shows a disconnected dialog (good).
However when resizing the frame, exception spam occurs.
Seems that the GamePanelManager is not cleared and is still requested to return its rescale requests. The question is: should it be nullified, reset? Can we resize the scalable components? If yes, we should support rescaling when State.Game == null. If the scalable components cannot be reused, we don't have anything to show, so rescaling would not make sense.