Empty objects if missing title in RDF ARTEFACT data

We get empty objects for artefacts with missing objectTitle, see https://dev.textgridlab.org/1.0/tgoaipmh/oai?verb=GetRecord&identifier=textgrid:276hd.0&metadataPrefix=oai_idiom_mets

We get a:

WARNING info.textgrid.middleware.RecordDelivererIDIOM.getRecordById ERROR getting IDIOM METS record for ID textgrid:2cgw4.0! java.util.NoSuchElementException: QueryIterPlainWrapper

warning right now on server side.