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<?

// компонент: catalog.section.list
// в result_modifier.php
// remove empty sections
foreach ($arResult['SECTIONS'] as $key => $value) {
	$res = CIBlockElement::GetList(
		array(), 
		array('ACTIVE' => 'Y', 'IBLOCK_ID' => $value['IBLOCK_ID'], 'SECTION_ID' => $value['ID'], 'CATALOG_AVAILABLE' => 'Y'), 
		false, 
		false, 
		array()
	);
	if ($res->SelectedRowsCount() < 1) {
		unset($arResult['SECTIONS'][$key]);
	}
}