xios not working when no ocean proc corresponds to xios proc
When using southward extended ORCA grid without ice shelf cavities and a lot of nemo processors, the first line of nemo processors at the domain bottom can be only composed of land processors which are eliminated from domain decomposition to save CPU. This special case is not handled correctly by xios which does not receive any information from nemo. To solve this issue, we propose to keep a nemo processor on the line of suppressed land processors, so it can communicate with xios corresponding processor, and allow xios to work correctly in this special configuration