Save house after opening so it doesn't throw an IO error if the user quits immediately.

GpApp/Menu.cpp

@@ -460,6 +460,7 @@ void DoHouseMenu (short theItem)
 		if (CreateNewHouse())
 		{
 			whoCares = InitializeEmptyHouse();
+			whoCares = WriteHouse(false);		// Save initial house so it's not an empty file if reloaded immediately
 			OpenCloseEditWindows();
 		}
 		break;