fixed issue in Python API tally arithmetic with tally multiplication
fixed issue in Python API tally arithmetic with tally multiplication

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