added 404 response code to DOI dosn't exist call to datacite
added 404 response code to DOI dosn't exist call to datacite

au-research/ANDS-ResearchData-Registry,au-research/ANDS-ResearchData-Registry,au-research/ANDS-ResearchData-Registry,au-research/ANDS-ResearchData-Registry,au-research/ANDS-ResearchData-Registry