Missing value in cdfbottomsig

[fschwarzkopf]

In cdfbottomsig, temperature and salinity fields are masked by using the "MissingValue" from the salinity file (can also be the temperature file if salinity is included there). In my input files, the "MissingValue" is set to 1e20 but does not apply to the salinity field itself - here, "dry" grid cells are masked with zero.

To overcome problems arising from the resulting unmasked fields I changed line 130 from
zsps = getspval(cf_sfil, cn_vosaline)
to
zsps = 0

I'm not sure, whether this only applies to the setting I'm working with or is a rather general behaviour. Therefore I submit this as an issue rather than a merge request.