fix sparqling from conjunctivegraphs for stores with their own query method, fixes #281
fix sparqling from conjunctivegraphs for stores with their own query method, fixes #281

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