UGGrid communication of a fixed size data handler fails with empty grid views
Description
I have a case where I want to use the communicate() method before performing loadBalance() with a fixed size data handler. This specifically fails when one of the UGGrid grid views is empty in any of the ranks. I traced back the error to this line, but I am not sure if this is really a bug or a desired behaviour, and what would be a suitable workaround for this. I didn't check whether this happens with other grids. Any ideas?
To reproduce this, I used the grid generated by make2DHybridTestGrid<UGGrid<2>>() in two ranks and then tried to communicate InteriorBorder_All_Interface using this class as a base for the actual DataHandler.