Fix bug when sampling multiple energy distributions
Fix bug when sampling multiple energy distributions

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