Prevent handle_lost_particle being called twice
Prevent handle_lost_particle being called twice

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