[PHP 8.4] Warning: foreach() argument must be of type array|object, string given

[ADDISON74]

This PR fixes issue #4312.

[sreichel]

Can u please add a debug breakpoint + trace here ... it should be an array ...

Mage_Adminhtml_Block_Widget_Grid::getMultipleRows()

    /**
     * Get children of specified item
     *
     * @param Varien_Object $item
     * @return array
     */
    public function getMultipleRows($item)
    {
        return $item->getChildren();
    }