Digital object CSV import changes, refs #5060
Digital object CSV import changes, refs #5060

Throw exception if information_object_id and identifier columns
are not present, don't look for non existing columns, show warning
when information object can't be found by identifier

artefactual/binder,kyfr59/atom-cg35,Surfrdan/atom,Surfrdan/atom,CENDARI/atom,kyfr59/atom-cg35,artefactual/atom,artefactual/atom,artefactual/atom,CENDARI/atom,CENDARI/atom,artefactual/binder,kyfr59/atom-cg35,artefactual/binder,Surfrdan/atom,artefactual/binder