code: def check_for_session(self, status=None):
          
          status = Status.LAST if status is None else status
          return os.path.isfile(self.get_restore_path(status)) and os.path.getsize(self.get_restore_path(status)) > 0
docs: check_for_session: see if session is in progress
              Args:
                  status (str): step to check if last session reached (optional)
              Returns: boolean indicating if session exists