GeoPlugin: Return empty collection if address was not found (#814)
GeoPlugin: Return empty collection if address was not found (#814)

* Return empty collection if address was not found

If the location of the ip address cannot be determined by GeoPlugin, return an empty AddressCollection instead of dummy data. This is particularly useful when using the Chain provider.

* Fix code style

Fix code style

geocoder-php/Geocoder,geocoder-php/Geocoder