Do not require schemes to have non-empty parameters
Do not require schemes to have non-empty parameters

Under some conditions, schemes must have non-zeros default parameters
(e.g. when multiple correctors are used at once). Now parameters sizes
in Netcdf parameter files are initialized to 0. Therefore if no
parameters are added to the file, the size will still be defined.

WFRT/Comps,WFRT/Comps,WFRT/Comps