Don't create move with quantity of zero

when synchronise outgoing moves with inventory moves

issue4632
review13081002

shipment.py

@@ -1155,6 +1155,8 @@ class ShipmentOut(Workflow, ModelSQL, ModelView):
                 else:
                     out_quantity = move.quantity
 
+                if not out_quantity:
+                    continue
                 unit_price = Uom.compute_price(move.product.default_uom,
                         move.product.list_price, move.uom)
                 to_create.append(shipment._get_outgoing_move(move))