XIOS aborting when an xios server has no data

[hiker]

Some consistency checks will fail if an xios server has no data, e.g.:

     bool hasAreaValueLocal = (!areavalue.isEmpty() && 0 != areavalue.numElements());

In this case areavalue is defined (i.e. not isEmpty()), but has size 0 on some xios server. This then triggers further tests which cause an abort.

The right approach seems to be to add a global operation to only set these values to False if all processes have set this to false.

With this additional patch my nemo test case finished successfully.

[hiker]

Note that I expect that there are more checks that would need the same patch, but without a test case triggering a problem I only do a minimal patch to get NEMO to work.