remove output suppression for get_nndc
remove output suppression for get_nndc

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