From 436daf0c4f22bd6cb8d761d2eaae7a9ae764a724 Mon Sep 17 00:00:00 2001
From: Jeremy Kersten <jke@odoo.com>
Date: Thu, 27 Aug 2015 18:00:18 +0200
Subject: [PATCH] [FIX] tools: lxml.etree.XMLSyntaxError if html is empty

Don't try to parse html as xml if html is empty
---
 openerp/tools/mail.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/openerp/tools/mail.py b/openerp/tools/mail.py
index b825e3cffdb..92af711dc94 100644
--- a/openerp/tools/mail.py
+++ b/openerp/tools/mail.py
@@ -475,6 +475,10 @@ def html2plaintext(html, body_id=None, encoding='utf-8'):
     ## download here: http://www.peterbe.com/plog/html2plaintext
 
     html = ustr(html)
+
+    if not html:
+        return ''
+
     tree = etree.fromstring(html, parser=etree.HTMLParser())
 
     if body_id is not None: