[FIX] delivery: Delivery method without redirect on courier provider's website

A UserError must be sent if the delivery method set on the delivery order
has no redirect on courier provider's website.

opw:668960

addons/delivery/i18n/delivery.pot

@@ -1074,6 +1074,12 @@ msgstr ""
 msgid "Shipment sent to carrier %s for expedition with tracking number %s"
 msgstr ""
 
+#. module: delivery
+#: code:addons/delivery/models/stock_picking.py:106
+#, python-format
+msgid "Your delivery method has no redirect on courier provider's website to track this order."
+msgstr ""
+
 #. module: delivery
 #: model:ir.model.fields,field_description:delivery.field_stock_picking_carrier_price
 msgid "Shipping Cost"

addons/delivery/models/stock_picking.py

@@ -100,11 +100,15 @@ class StockPicking(models.Model):
     @api.multi
     def open_website_url(self):
         self.ensure_one()
+        if self.carrier_id.get_tracking_link(self):
+            url = self.carrier_id.get_tracking_link(self)[0]
+        else:
+            raise UserError(_("Your delivery method has no redirect on courier provider's website to track this order."))
 
         client_action = {'type': 'ir.actions.act_url',
                          'name': "Shipment Tracking Page",
                          'target': 'new',
-                         'url': self.carrier_id.get_tracking_link(self)[0]
+                         'url': url,
                          }
         return client_action