code: def fetchRootJob(self):
          
          try:
              return self.jobStore.loadRootJob()
          except JobException:
              print('Root job is absent. The workflow may have completed successfully.', file=sys.stderr)
              raise
docs: Fetches the root job from the jobStore that provides context for all other jobs.
  
          Exactly the same as the jobStore.loadRootJob() function, but with a different
          exit message if the root job is not found (indicating the workflow ran successfully
          to completion and certain stats cannot be gathered from it meaningfully such
          as which jobs are left to run).
  
          :raises JobException: if the root job does not exist.