Datasets with no posted contacts should return properly structured responses through the API.

[SimonGoring]

This primarily affects the datasets/:dsid:/contacts endpoint, but likely affects any other contact endpoints. They should all return information with:

{contactid: null, fullname: null, lastname: null, firstname: null, url: null, email: null, address: null}.

[SimonGoring]

An example is dataset 4628 (from FAUNMAP).

A full list of datasets without listed PIs can be obtained using:

SELECT ds.datasetid
FROM                     ndb.datasets  AS ds
LEFT OUTER JOIN ndb.datasetpis AS dspi ON ds.datasetid = dspi.datasetid
WHERE dspi.contactid IS NULL