Retrieves the city name for the given location.
For a `GWEATHER_LOCATION_CITY` or `GWEATHER_LOCATION_DETACHED` location, this method is equivalent to [[email protected]_name] .
For a `GWEATHER_LOCATION_WEATHER_STATION` location, this is equivalent to calling [[email protected]_name] on the location's parent.
For other locations this method will return `NULL`.
| this |
a Location |
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the city name of the location |