handle xml parsing errors better
handle xml parsing errors better

amandalund/openmc,smharper/openmc,paulromano/openmc,walshjon/openmc,bhermanmit/openmc,shikhar413/openmc,samuelshaner/openmc,paulromano/openmc,mit-crpg/openmc,paulromano/openmc,wbinventor/openmc,shikhar413/openmc,samuelshaner/openmc,mit-crpg/openmc,samuelshaner/openmc,amandalund/openmc,paulromano/openmc,walshjon/openmc,johnnyliu27/openmc,mjlong/openmc,wbinventor/openmc,mjlong/openmc,liangjg/openmc,smharper/openmc,johnnyliu27/openmc,johnnyliu27/openmc,amandalund/openmc,lilulu/openmc,amandalund/openmc,kellyrowland/openmc,bhermanmit/openmc,samuelshaner/openmc,lilulu/openmc,liangjg/openmc,wbinventor/openmc,johnnyliu27/openmc,smharper/openmc,liangjg/openmc,smharper/openmc,walshjon/openmc,mit-crpg/openmc,mit-crpg/openmc,shikhar413/openmc,wbinventor/openmc,lilulu/openmc,liangjg/openmc,shikhar413/openmc,kellyrowland/openmc,walshjon/openmc