Fix check for no angle distribution in elastic scattering
Fix check for no angle distribution in elastic scattering

amandalund/openmc,walshjon/openmc,paulromano/openmc,walshjon/openmc,smharper/openmc,shikhar413/openmc,amandalund/openmc,mit-crpg/openmc,smharper/openmc,shikhar413/openmc,mit-crpg/openmc,amandalund/openmc,liangjg/openmc,smharper/openmc,shikhar413/openmc,amandalund/openmc,liangjg/openmc,mit-crpg/openmc,smharper/openmc,paulromano/openmc,mit-crpg/openmc,walshjon/openmc,walshjon/openmc,liangjg/openmc,paulromano/openmc,liangjg/openmc,paulromano/openmc,shikhar413/openmc