Handle None grounding in concepts
Handle None grounding in concepts

sorgerlab/indra,bgyori/indra,bgyori/indra,sorgerlab/belpy,johnbachman/indra,johnbachman/indra,sorgerlab/indra,sorgerlab/belpy,sorgerlab/indra,sorgerlab/belpy,johnbachman/indra,bgyori/indra