[FIX] delivery: Ensure carrier availability iteration after a fail

With a UPS delivery type carrier,
`ups_get_shipping_price_from_so` can return a `ValidationError`,
making the carrier unavailable for this order.
Nevertheless, the iteration checking the availability of the remaining
carriers must be ensured.

opw-657161

addons/delivery/models/delivery_carrier.py

@@ -21,7 +21,7 @@
 
 import logging
 from openerp import models, fields, api
-from openerp.exceptions import UserError
+from openerp.exceptions import UserError, ValidationError
 
 _logger = logging.getLogger(__name__)
 
@@ -72,6 +72,9 @@ class DeliveryCarrier(models.Model):
                         # no suitable delivery method found, probably configuration error
                         _logger.info("Carrier %s: %s, not found", self.name, e.name)
                         self.price = 0.0
+                except ValidationError as e:
+                    _logger.info("Carrier %s: %s, not available: %s", self.name, e.name, e.message)
+                    self.price = 0.0
             else:
                 res = super(DeliveryCarrier, self).get_price('price', [])
                 self.available = res[self.id]['available']