proper handling of None contexts and passing Graphs with wrapped store instead of Auditable Storage instance
proper handling of None contexts and passing Graphs with wrapped store instead of Auditable Storage instance

git-svn-id: 60eb48102d1ca0c284ab3654bef916b01e1b221b@613 4f84a9ca-5c3e-0410-8a68-0bdf370325d5

nwebs/rdflib