Now check nu_fission data in mgxs_library python api when determining if dataset is fissionable or not.
Now check nu_fission data in mgxs_library python api when determining if dataset is fissionable or not.

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