docs: def is_exported(bundle):
      """ Returns True if dataset is already exported to CKAN. Otherwise returns False. """
      if not ckan:
          raise EnvironmentError(MISSING_CREDENTIALS_MSG)
      params = {'q': 'name:{}'.format(bundle.dataset.vid.lower())}
      resp = ckan.action.package_search(**params)
      return len(resp['results']) > 0