Fix to Pricing Rule for Magneto >= 1.9.2.0

# MUST PATCH for Magento version >= 1.9.2.0

http://magento.stackexchange.com/questions/53699/fatal-error-when-adding-configurable-product-in-cart-and-using-products-subsele
https://gist.github.com/tux-rampage/4d318ef516c8f4b2cf7e#file-luka-mce20151203-salesrule-hotfix-patch

### Example

app/code/local/Mage/SalesRule/Model/Rule/Condition/Product/Combine.php

```
public function validate(Varien_Object $object)
{
    /** @var Mage_Catalog_Model_Product $product */
    $product = $object->getProduct();
    if (!($product instanceof Mage_Catalog_Model_Product)) {
        $product = Mage::getModel('catalog/product')->load($object->getProductId());
    }

    $valid = parent::validate($object);
    if (!$valid && $product->getTypeId() == Mage_Catalog_Model_Product_Type_Configurable::TYPE_CODE) {
        $children = $object->getChildren();
        $valid = $children && self::validate($children[0]);
    }

    return $valid;
}
```

web/app/code/core/Mage/SalesRule/Model/Rule/Condition/Product/Subselect.php

```
public function validate(Varien_Object $object)
{
    if (!$this->getConditions()) {
        return false;
    }

//        $value = $this->getValue();
//        $aggregatorArr = explode('/', $this->getAggregator());
//        $this->setValue((int)$aggregatorArr[0])->setAggregator($aggregatorArr[1]);

    // The parent class is passing children of configurable items to this method again
    // this is causing an infinite recursion if we let it pass
    if ($object->getParentItemId()) {
        return parent::validate($object);
    }

    $attr = $this->getAttribute();
    $total = 0;
    foreach ($object->getQuote()->getAllVisibleItems() as $item) {
        if (parent::validate($item)) {
            $total += $item->getData($attr);
        }
    }
//        $this->setAggregator(join('/', $aggregatorArr))->setValue($value);

    return $this->validateAttribute($total);
}
```