[-] BO: Fix stock when combinations are removed.

classes/stock/StockAvailable.php

@@ -108,6 +108,10 @@ class StockAvailableCore extends ObjectModel
 	
 	public static function getStockAvailableIdByProductId($id_product, $id_product_attribute = null, $id_shop = null)
 	{
+		// if null, it's a product without attributes
+		if ($id_product_attribute === null)
+			$id_product_attribute = 0;
+    
 		if (!Validate::isUnsignedId($id_product))
 			return false;
 
@@ -115,9 +119,7 @@ class StockAvailableCore extends ObjectModel
 		$query->select('id_stock_available');
 		$query->from('stock_available');
 		$query->where('id_product = '.(int)$id_product);
-
-		if ($id_product_attribute !== null)
-			$query->where('id_product_attribute = '.(int)$id_product_attribute);
+		$query->where('id_product_attribute = '.(int)$id_product_attribute);
 
 		$query = StockAvailable::addSqlShopRestriction($query, $id_shop);
 		return (int)Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue($query);
@@ -172,7 +174,7 @@ class StockAvailableCore extends ObjectModel
 					if ($order_id_shop != null && !count(array_intersect($allowed_warehouse_for_product_clean, $order_warehouses)))
 						continue;
 
-					$product_quantity = $manager->getProductRealQuantities($id_product, null, $allowed_warehouse_for_product_clean, true);
+					$product_quantity = $manager->getProductRealQuantities($id_product, 0, $allowed_warehouse_for_product_clean, true);
 					
 					Hook::exec('actionUpdateQuantity',
 									array(

classes/stock/StockManager.php

@@ -423,6 +423,10 @@ class StockManagerCore implements StockManagerInterface
 	 */
 	public function getProductPhysicalQuantities($id_product, $id_product_attribute, $ids_warehouse = null, $usable = false)
 	{
+		// if null, it's a product without attributes
+		if ($id_product_attribute === null)
+			$id_product_attribute = 0;
+    
 		if (!is_null($ids_warehouse))
 		{
 			// in case $ids_warehouse is not an array
@@ -441,8 +445,7 @@ class StockManagerCore implements StockManagerInterface
 		$query->select('SUM('.($usable ? 's.usable_quantity' : 's.physical_quantity').')');
 		$query->from('stock', 's');
 		$query->where('s.id_product = '.(int)$id_product);
-		if (0 != $id_product_attribute)
-			$query->where('s.id_product_attribute = '.(int)$id_product_attribute);
+		$query->where('s.id_product_attribute = '.(int)$id_product_attribute);
 
 		if (count($ids_warehouse))
 			$query->where('s.id_warehouse IN('.implode(', ', $ids_warehouse).')');
@@ -455,6 +458,10 @@ class StockManagerCore implements StockManagerInterface
 	 */
 	public function getProductRealQuantities($id_product, $id_product_attribute, $ids_warehouse = null, $usable = false)
 	{
+		// if null, it's a product without attributes
+		if ($id_product_attribute === null)
+			$id_product_attribute = 0;
+    
 		if (!is_null($ids_warehouse))
 		{
 			// in case $ids_warehouse is not an array