avoiding irrelevant warning message when not overriding a cell-based rdf:value predicate.
avoiding irrelevant warning message when not overriding a cell-based rdf:value predicate.

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