Handle corner cases in processing BioPAX dbrefs
Handle corner cases in processing BioPAX dbrefs

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