def _get_daily_data_collections(self, data_type, unit, values):
data_header = Header(data_type=data_type, unit=unit,<EOL>analysis_period=self.analysis_period,<EOL>metadata={'<STR_LIT:source>': self._location.source,<EOL>'<STR_LIT>': self._location.country,<EOL>'<STR_LIT>': self._location.city})<EOL>return HourlyContinuousCollection(data_header, values)<EOL>
Return an empty data collection.