docs: def resolved_flag(bag):
      """
      Check DOI flag in bag.info to see if doi_resolver has been previously run
      :param obj bag: Bag
      :return bool: Flag
      """
      if 'DOI-Resolved' in bag.info:
          logger_bagit.info("bagit resolved_flag: true")
          return True
      logger_bagit.info("bagit resolved_flag: false")
      return False