[IMP] stock: don't show layout config before Routes diagram

When an external report layout has not been setup and an admin user
tries to click on Routes: View Diagram within a product form > Inventory
then the document template setup would open even though it is not
necessary for this diagram.

Specification 10 of inventory usability task.
Task: 2206279
Related Enterprise PR: odoo/enterprise#10723

addons/stock/models/product.py

@@ -797,7 +797,7 @@ class ProductTemplate(models.Model):
             return self.env.ref('stock.action_report_stock_rule').report_action(None, data={
                 'product_id': products.id,
                 'warehouse_ids': warehouse.ids,
-            })
+            }, config=False)
         action = self.env.ref('stock.action_stock_rules_report').read()[0]
         action['context'] = self.env.context
         return action