sunyu::fixbug::fix bug about material price NPE

shopping-cart-application-service/src/main/java/cn/freemud/service/impl/mcoffee/calculation/CalculationServiceImpl.java

@@ -502,7 +502,7 @@ public class CalculationServiceImpl {
         //单品、多规格加料
         if(CollectionUtils.isNotEmpty(cartGoods.getProductMaterialList())){
             for (CartGoods.MaterialGoods materialGoods : cartGoods.getProductMaterialList()){
-                materialPrice+= materialGoods.getFinalPrice() * cartGoods.getQty();
+                materialPrice+= (null != materialGoods.getFinalPrice() ? materialGoods.getFinalPrice() : 0) * (null != cartGoods.getQty() ? cartGoods.getQty() : 0);
             }
         }
         return materialPrice;