From dc7b2dff029f04cc084c81a3d6e3c96330ec9391 Mon Sep 17 00:00:00 2001
From: Martin Trigaux <mat@odoo.com>
Date: Thu, 15 Mar 2018 16:35:34 +0100
Subject: [PATCH] [FIX] crm: partial backport of 78b7996d

It appears there is more partners withotu a create_date than I expected on
legacy databases

opw-1827099
---
 addons/crm/wizard/base_partner_merge.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/addons/crm/wizard/base_partner_merge.py b/addons/crm/wizard/base_partner_merge.py
index e76d243fe11..7af4b7487ed 100644
--- a/addons/crm/wizard/base_partner_merge.py
+++ b/addons/crm/wizard/base_partner_merge.py
@@ -379,7 +379,7 @@ class MergePartnerAutomatic(models.TransientModel):
             :param partner_ids : list of partner ids to sort
         """
         return self.env['res.partner'].browse(partner_ids).sorted(
-            key=lambda p: (p.active, p.create_date),
+            key=lambda p: (p.active, (p.create_date or '')),
             reverse=True,
         )