CWebDavIblock::IsTrashEmpty

function IsTrashEmpty()
{
	static $dataType = 'TrashEmpty';
	$trashEmpty = $this->_dataCache($dataType);

	if ($trashEmpty === false)
	{
		$trashEmpty = 'Y';
		$trashSectionID = $this->GetMetaID('TRASH');
		$cnt = CIBlockElement::GetList(
			Array("ID"=>"DESC"),
			$arFilter=Array("SHOW_HISTORY"=>"Y", "IBLOCK_ID"=>$this->IBLOCK_ID, "SECTION_ID"=>$trashSectionID),
			array(),
			false,
			array('ID')
		);
		if ($cnt > 0)
		{
			$trashEmpty = 'N';
		}
		else
		{
			$dbTrash = CIBlockSection::GetList(Array("ID"=>"DESC"), $arFilter=Array("SHOW_HISTORY"=>"Y", "IBLOCK_ID"=>$this->IBLOCK_ID, "SECTION_ID"=>$trashSectionID), false, array("ID"));
			if ($dbTrash && $arTrashItem = $dbTrash->Fetch())
			{
				$trashEmpty = 'N';
			}
		}

		$this->_dataCache($dataType, $trashEmpty);
	}
	return ($trashEmpty==='Y');
}