From 856f35eb216a82aa8afd086f54903f59c1e1f031 Mon Sep 17 00:00:00 2001
From: Jeremy Kersten <jke@odoo.com>
Date: Tue, 1 Aug 2017 10:36:34 +0200
Subject: [PATCH] [FIX] UserError: don't display None in Warning popup.

UserError uses a retrocompatibility function 'except_orm' which one can take a
second parameters. The default value of this second param is None, so if we
don't force an empty string, we will see a None on each raise UserError as last line.
---
 odoo/exceptions.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/odoo/exceptions.py b/odoo/exceptions.py
index d83e350c624..edde12cb3ae 100644
--- a/odoo/exceptions.py
+++ b/odoo/exceptions.py
@@ -30,7 +30,7 @@ class except_orm(Exception):
 
 class UserError(except_orm):
     def __init__(self, msg):
-        super(UserError, self).__init__(msg)
+        super(UserError, self).__init__(msg, value='')
 
 
 # deprecated due to collision with builtins, kept for compatibility