m2o : cannot create and edit a product

traceback when i create and edit a product form a m2o. It seems occur only with product in any conditions (form, o2m, list editable, ...)

to test :

- create a SO
- create a SO line and enter an unknow product name. In the m2o, create and edit it -> bug :

Client Traceback (most recent call last):
  File "/home/aline/source/web/trunk/addons/web/common/http.py", line 180, in dispatch
    response["result"] = method(controller, self, **self.params)
  File "/home/aline/source/web/trunk/addons/web/controllers/main.py", line 877, in onchange
    if 'domain' not in result:
TypeError: argument of type 'bool' is not iterable