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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_location(self, locations=None):
 # type: (Optional[List[str]]) -> List[str] """Return the dataset's location Args: locations (Optional[List[str]]):
 Valid locations list. Defaults to list downloaded from HDX. Returns: List[str]: list of locations or [] if there are none """

        countries = self.data.get('groups', None)
        if not countries:
            return list()
        return [Locations.get_location_from_HDX_code(x['name'], locations=locations,
                                                     configuration=self.configuration) for x in countries]