Engine crashes with precipitation object.

When you add a precipitation object. e.g. HeavyRain to a scene and this object is active during mission start (SinglePlay), the engine crashes in precipitation.cc at the line:

control->getCameraTransform(&pos, &camMat);

(conrol is null)

The problem is, that the advanceTime method of Precipitation is called, before the player has connected to the game and a not null control object is set on the gameconnection object.

I think a check, similar to the one:

GameConnection * con = GameConnection::getServerConnection();
   if(!con)
      return;

has to be added for the control object, too:

ShapeBase* control = con->getControlObject();
   if(!control)
	return;

Best regards
-- Markus