[FIX] fields property: do not create empty properties

fixes #595
In the case where a property for the company exists but has no related record (e.g. in case of type m2o with no defined value), not setting a value to this field for a new record would create a new property (as browse_null is not an instance of browse_record)

diff --git a/openerp/osv/fields.py b/openerp/osv/fields.py
index 4942136..040548e 100644 (file)
--- a/openerp/osv/fields.py
+++ b/openerp/osv/fields.py
@@ -1428,7 +1428,8 @@ class property(function):
         default_val = self._get_default(obj, cr, uid, prop_name, context)
 
         property_create = False
-        if isinstance(default_val, openerp.osv.orm.browse_record):
+        if isinstance(default_val, (openerp.osv.orm.browse_record,
+                                    openerp.osv.orm.browse_null)):
             if default_val.id != id_val:
                 property_create = True
         elif default_val != id_val: