CivicGksMolecularProfile extension should not include coordinates that are all null

[korikuzma]

civicpy/civicpy/exports/civic_gks_record.py

Lines 299 to 316 in 0ab6099

	if isinstance(variant.coordinates, Coordinate):
	coords = variant.coordinates
	extensions.append(
	Extension(
	name="CIViC representative coordinate",
	value={
	"chromosome": coords.chromosome,
	"start": coords.start,
	"stop": coords.stop,
	"reference_bases": coords.reference_bases,
	"variant_bases": coords.variant_bases,
	"ensembl_version": coords.ensembl_version,
	"representative_transcript": coords.representative_transcript,
	"reference_build": coords.reference_build,
	"type": coords.type,
	},
	)
	)

There are some instances where this returns:

{
          "name": "CIViC representative coordinate",
          "value": {
            "chromosome": null,
            "start": null,
            "stop": null,
            "reference_bases": null,
            "variant_bases": null,
            "ensembl_version": null,
            "representative_transcript": null,
            "reference_build": null,
            "type": "coordinates"
          }
        }

This isn't really useful. We should either exclude this from the extensions entirely or just set the value to null. I think it's fine to exclude and assume it will only be present if there is at least one non-null value.