[FIX] website: GeoIP Legacy compatibility

Some IPs (like google-proxy ones) are not bound to a specific country.
Legacy Database used to set country_code to 'EU' for these one. geoip2,
on contrary, does not set the country. Read information from `continent`
attribute in this case.

opw-1844888

addons/website/geoipresolver.py

@@ -47,10 +47,14 @@ class GeoIPResolver(object):
                 r = self._db.city(ip)
             except (ValueError, geoip2.errors.AddressNotFoundError):
                 return {}
+            # Compatibility with Legacy database.
+            # Some ips cannot be located to a specific country. Legacy DB used to locate them in
+            # continent instead of country. Do the same to not change behavior of existing code.
+            country = r.country if r.country.geoname_id else r.continent
             return {
                 'city': r.city.name,
-                'country_code': r.country.iso_code,
-                'country_name': r.country.name,
+                'country_code': country.iso_code,
+                'country_name': country.name,
                 'region': r.subdivisions[0].iso_code if r.subdivisions else None,
                 'time_zone': r.location.time_zone,
             }