NQuads serializer requires context-aware store so exclude the plugin from this test.
NQuads serializer requires context-aware store so exclude the plugin from this
test.

armandobs14/rdflib,dbs/rdflib,ssssam/rdflib,ssssam/rdflib,avorio/rdflib,armandobs14/rdflib,yingerj/rdflib,RDFLib/rdflib,ssssam/rdflib,yingerj/rdflib,avorio/rdflib,dbs/rdflib,yingerj/rdflib,dbs/rdflib,armandobs14/rdflib,avorio/rdflib,dbs/rdflib,marma/rdflib,yingerj/rdflib,armandobs14/rdflib,RDFLib/rdflib,marma/rdflib,RDFLib/rdflib,marma/rdflib,ssssam/rdflib,RDFLib/rdflib,avorio/rdflib,marma/rdflib