docs: def process(self, pq):
          """
          :arg PlaceQuery pq: PlaceQuery instance
          :returns: modified PlaceQuery, or ``False`` if country is not acceptable.
          """
          # Map country, but don't let map overwrite
          if pq.country not in self.acceptable_countries and pq.country in self.country_map:
              pq.country = self.country_map[pq.country]
          if pq.country != '' and \
             self.acceptable_countries != [] and \
             pq.country not in self.acceptable_countries:
              return False
          return pq