$value1 = $this->objFormParam->getValue('classcategory_id1');
$value2 = $this->objFormParam->getValue('classcategory_id2');

if($value1 == ''){
    $value1 = '__unselected';
}
if($value2 == ''){
    $value2 = '__unselected';
} else {
    $value2 = '#' . $value2;
}

$this->tpl_product_class_id = $objProduct->classCategories[$product_id][$value1][$value2]['product_class_id'];

$this->tpl_product_class_id = $objProduct->classCategories[$product_id]['__unselected']['__unselected']['product_class_id'];
$this->tpl_product_type = $objProduct->classCategories[$product_id]['__unselected']['__unselected']['product_type'];