Allow rotation to be set without fill assigned when reading summary file
Allow rotation to be set without fill assigned when reading summary file

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