Dataset link simplification - protect code if http status is null (fo… #66

Job	Run time
build_docker_images (linkchecker) / Build linkchecker Docker image	1m 27s
build_docker_images (full-orchestrator) / Build full-orchestrator Docker image	1m 14s
build_docker_images (ingester) / Build ingester Docker image	1m 14s
build_docker_images (csw-harvester) / Build csw-harvester Docker image	1m 5s
	5m 0s

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