Fix test accessing SosModel/SectorModel parameters
Fix test accessing SosModel/SectorModel parameters

- each model only has its own parameters as added. To check how best to access
  and reflect on existence of global parameters

tomalrussell/smif,nismod/smif,willu47/smif,tomalrussell/smif,nismod/smif,willu47/smif,willu47/smif,nismod/smif,willu47/smif,tomalrussell/smif,tomalrussell/smif,nismod/smif