Dokument in BfG Geoportal harvester contains empty Resource
The dataset "Technisch-biologischen Ufersicherungsmaßnahmen in Ästuaren" (see. harvester/regression-test/datasets/geodatenkatalog-bfg/51bdc44e-f7ce-4720-afe4-213bcc2de42f.json) contains an empty resource with url = ''
I think this might bite us later and should be fixed.