A more descriptive exception needed in case of triples modifications to a non-existent graph in store.
The exception thrown by Mulgara when triple operations are peformed on a non-existent graph is quite confusing. For example, currently you might see:
org.mulgara.query.QueryException: Unsupported protocol for destination graph (local, -1 : 'local')
It would be a little more useful to see:
org.mulgara.query.MissingGraphException: Graph <graph uri> not created in store.
or something like that.
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