fixes #347; fixed null pointer in isURI(); fixed dangling bundle if [!]
fixes #347; fixed null pointer in isURI(); fixed dangling bundle if [!]

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