Make sure material density is set from Python API
Make sure material density is set from Python API

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