permitted conversion:null as a predicate; omits it
permitted conversion:null as a predicate; omits it

timrdf/csv2rdf4lod-automation,timrdf/csv2rdf4lod-automation,timrdf/csv2rdf4lod-automation,timrdf/csv2rdf4lod-automation,timrdf/csv2rdf4lod-automation,timrdf/csv2rdf4lod-automation,timrdf/csv2rdf4lod-automation,timrdf/csv2rdf4lod-automation