From 80dc23e00282963e84292033a7c1f2734b28e429 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Thu, 11 Dec 2014 22:23:37 +0100
Subject: [PATCH] Allow domain inversion to set None to X2M field

When domain is like ('field', '=', None), the domain inversion set the value to
None.

issue4301
review10701002
---
 tryton/gui/window/view_form/model/field.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tryton/gui/window/view_form/model/field.py b/tryton/gui/window/view_form/model/field.py
index b15712b236..e62a834a73 100644
--- a/tryton/gui/window/view_form/model/field.py
+++ b/tryton/gui/window/view_form/model/field.py
@@ -626,6 +626,9 @@ class O2MField(Field):
         self._connect_value(group)
 
     def set_client(self, record, value, force_change=False):
+        # domain inversion could try to set None as value
+        if value is None:
+            value = []
         # domain inversion could try to set id as value
         if isinstance(value, (int, long)):
             value = [value]