Where is $arResult['ITEMS'] formed which is used in the catalog.section component template?

Question

1C-Bitrix

An empty $arResult['ITEMS'] comes to the catalog.section component template. In which file is this array formed?

Answer 1

this array is formed in the core of the component, which in turn is formed with a filter condition, if you receive an empty one, then you have incorrectly set the component settings.

Answer 2

bitrix/components/bitrix/catalog.section/class.php
protected function processResultData()
bitrix/modules/iblock/lib/component/base.php
bitrix/modules/iblock/lib/component/elementlist.php
$this->arResult[ 'ITEMS'] = $this->elements;
proofreading in
bitrix/modules/iblock/lib/component/base.php
protected function initElementList()