PropertyFeature::checkFeatureList

static function checkFeatureList(array $list): ?array
{
	if (empty($list))
		return null;

	$result = [];
	foreach ($list as $rawRow)
	{
		$row = self::checkFeature($rawRow);
		if ($row === null)
			return null;
		$result[self::getIndex($row)] = $row;
	}
	unset($rawRow);

	return $result;
}