avoid null ids when migrating from DVN 3.6.3 to DV 4.x (#3161)
avoid null ids when migrating from DVN 3.6.3 to DV 4.x (#3161)

ekoi/DANS-DVN-4.6.1,jacksonokuhn/dataverse,bmckinney/dataverse-canonical,bmckinney/dataverse-canonical,bmckinney/dataverse-canonical,JayanthyChengan/dataverse,JayanthyChengan/dataverse,bmckinney/dataverse-canonical,JayanthyChengan/dataverse,jacksonokuhn/dataverse,ekoi/DANS-DVN-4.6.1,jacksonokuhn/dataverse,ekoi/DANS-DVN-4.6.1,ekoi/DANS-DVN-4.6.1,bmckinney/dataverse-canonical,ekoi/DANS-DVN-4.6.1,bmckinney/dataverse-canonical,JayanthyChengan/dataverse,JayanthyChengan/dataverse,JayanthyChengan/dataverse,jacksonokuhn/dataverse,bmckinney/dataverse-canonical,jacksonokuhn/dataverse,JayanthyChengan/dataverse,ekoi/DANS-DVN-4.6.1,jacksonokuhn/dataverse,jacksonokuhn/dataverse,jacksonokuhn/dataverse,JayanthyChengan/dataverse,ekoi/DANS-DVN-4.6.1,ekoi/DANS-DVN-4.6.1,bmckinney/dataverse-canonical