treat unfound case correctly
treat unfound case correctly

shikhar413/openmc,shikhar413/openmc,shikhar413/openmc,shikhar413/openmc,amandalund/openmc,walshjon/openmc,walshjon/openmc,amandalund/openmc,walshjon/openmc,walshjon/openmc,amandalund/openmc,amandalund/openmc