Selector::checkPresetSettings

protected function checkPresetSettings(array $settings)
{
	if (empty($settings['FILTER']) || !is_array($settings['FILTER']))
	{
		return null;
	}

	$preset = array_filter($settings['FILTER'], ['BitrixLandingSourceBlockFilter', 'checkPreparedRow']);
	if (empty($preset))
	{
		return null;
	}

	return [
		'FILTER' => $preset
	];
}