[BUG] For some cities, current data is reported but historical data is not. Example: get_city_air('Kinshasa') returns a valid result, but get_historical_data(city='Kinshasa') reurns 'Exception: The search for city "Kinshasa" returns no result. It is possible that the city does not have AQI station.'

[BUG] For some cities, current data is reported but historical data is not. Example: get_city_air('Kinshasa') returns a valid result, but get_historical_data(city='Kinshasa') reurns 'Exception: The search for city "Kinshasa" returns no result. It is possible that the city does not have AQI station.' #331