[FIX] base: change the code by returning 'or False' on return

bzr revid: rgo@tinyerp.com-20110929050938-t2fkg4o4xwwpdsei

diff --cc bin/addons/base/ir/ir_model.py
index 0c3cd46,6d18c6d..d68513a
--- 1/bin/addons/base/ir/ir_model.py
--- 2/bin/addons/base/ir/ir_model.py
+++ b/bin/addons/base/ir/ir_model.py
@@@ -512,7 -512,7 +512,7 @@@ class ir_model_access(osv.osv)
              }
  
              raise except_orm(_('AccessError'), msgs[mode] % (model_name, groups) )
--        return r
++        return r or False
  
      check = tools.cache()(check)