fixed errant histogram scatter matrix printing
fixed errant histogram scatter matrix printing

walshjon/openmc,walshjon/openmc,shikhar413/openmc,walshjon/openmc,wbinventor/openmc,smharper/openmc,shikhar413/openmc,johnnyliu27/openmc,bhermanmit/openmc,liangjg/openmc,mit-crpg/openmc,amandalund/openmc,shikhar413/openmc,mit-crpg/openmc,johnnyliu27/openmc,wbinventor/openmc,wbinventor/openmc,johnnyliu27/openmc,mit-crpg/openmc,liangjg/openmc,walshjon/openmc,paulromano/openmc,mit-crpg/openmc,smharper/openmc,amandalund/openmc,amandalund/openmc,shikhar413/openmc,liangjg/openmc,paulromano/openmc,bhermanmit/openmc,paulromano/openmc,liangjg/openmc,smharper/openmc,johnnyliu27/openmc,wbinventor/openmc,smharper/openmc,paulromano/openmc,amandalund/openmc