Throw an exception if CRS appreviation is empty.
Throw an exception if CRS appreviation is empty.

Appreviation is needed in axisLabels of response of DescribeCoverage
request. Dataset names are also used when a dataset is trimmed and sliced.

pjukka/smartmet-plugin-wcs,pjukka/smartmet-plugin-wcs,pjukka/smartmet-plugin-wcs,pjukka/smartmet-plugin-wcs