[FIX] revert rev 4018 (revid:rco@openerp.com-20120208162334-ziccpi3yczp3r5z5)

bzr revid: rco@openerp.com-20120209083828-hoojows5zsg0xrif

openerp/addons/base/ir/ir_model.py

@@ -506,8 +506,7 @@ class ir_model_access(osv.osv):
             model_name = model
 
         # TransientModel records have no access rights, only an implicit access rule
-        model_obj = self.pool.get(model_name)
-        if model_obj and model_obj.is_transient():
+        if self.pool.get(model_name).is_transient():
             return True
 
         # We check if a specific rule exists