h4h5tools

Fix a bug regarding empty SDS conversion. If SDcheckempty() says an SDS is empty, dimensional scales were not converted. This changelist fixes this so that HDF-EOS2 dimensions are correctly converted into netCDF-4 dimensions.

According to the return value of SDcheckempty(), H4toH5_sds() behaved very differently.

  if SDcheckempty() says this SDS is not empty,
    create an HDF5 dataset
    convert attributes ...
    call H4toH5all_dimscale()
  else
    call convert_sdsfillvalue()

That is, if SDcheckempty() says this SDS is empty, H4toH5all_dimscalecdf() was not called, which skips converting dimensions.

This changelist makes convert_sdsfillvalue() calls H4toH5all_dimscalecdf().