Better handling for PubMed IDs with no corresponding DOI. The case I hit has a DOI but the ID API does not return one (their database may not be up-to-date).
Better handling for PubMed IDs with no corresponding DOI. The case I hit has a DOI but the ID API does not return one (their database may not be up-to-date).

Kortemme-Lab/klab,Kortemme-Lab/klab,Kortemme-Lab/klab,Kortemme-Lab/klab