Fix: hasPart is not removed from parent when deleting object
Fix: hasPart is not removed from parent when deleting object

jschnasse/regal-api,jschnasse/regal-api,edoweb/regal-api,jschnasse/regal-api,edoweb/regal-api,edoweb/regal-api,jschnasse/regal-api,edoweb/regal-api