Raise an error if no ontology path is given
This fixes a crash I discovered. Since a0efd197 it was possible to crash by passing a NULL ontology path to tracker_sparql_connection_new(). Now we raise an error instead.
This fixes a crash I discovered. Since a0efd197 it was possible to crash by passing a NULL ontology path to tracker_sparql_connection_new(). Now we raise an error instead.