Don't process shipping resource If Shopping Cart is None

bt5/erp5_commerce/SkinTemplateItem/portal_skins/erp5_commerce/SaleOrder_getSelectedShippingResource.xml

@@ -190,6 +190,8 @@
   Return selected shipping method from shopping cart\n
 """\n
 shopping_cart = context.SaleOrder_getShoppingCart()\n
+if shopping_cart is None:\n
+  return None\n
 shipping_method = getattr(shopping_cart, \'shipping_method\', None)\n
 if shipping_method is not None:\n
   return shipping_method.getResourceValue()\n

bt5/erp5_commerce/bt/revision

-325
\ No newline at end of file
+326
\ No newline at end of file