Don't make action depend on login

login field is not in the preference fields so action can not depend on it
because otherwise the preferences dialog will not be valided.

issue2125

trytond/res/user.py

@@ -16,7 +16,7 @@ from trytond.backend import TableHandler
 from trytond.security import get_connections
 from trytond.transaction import Transaction
 from trytond.cache import Cache
-from trytond.pyson import Eval, Not, Equal
+from trytond.pyson import Eval, Bool
 from trytond.pool import Pool
 
 
@@ -31,8 +31,8 @@ class User(ModelSQL, ModelView):
     signature = fields.Text('Signature')
     active = fields.Boolean('Active')
     action = fields.Many2One('ir.action', 'Home Action', states={
-        'required': Not(Equal(Eval('login'), 'root')),
-        }, depends=['login'])
+        'required': Bool(Eval('id')),
+        }, depends=['id'])
     menu = fields.Many2One('ir.action', 'Menu Action',
             domain=[('usage','=','menu')], required=True)
     groups = fields.Many2Many('res.user-res.group',