From 534da7c07b23ee800aed4c5495aaa9caf7276973 Mon Sep 17 00:00:00 2001
From: Xavier Morel <xmo@openerp.com>
Date: Wed, 26 Oct 2011 14:18:56 +0200
Subject: [PATCH] [MERGE] upstream fixes

bzr revid: xmo@openerp.com-20111026121856-q9cso26sh2mp6b3s
---
 addons/web_diagram/static/lib/js/dracula_graph.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/addons/web_diagram/static/lib/js/dracula_graph.js b/addons/web_diagram/static/lib/js/dracula_graph.js
index ff8ba3a423d..46096e0acb1 100644
--- a/addons/web_diagram/static/lib/js/dracula_graph.js
+++ b/addons/web_diagram/static/lib/js/dracula_graph.js
@@ -378,6 +378,8 @@ Graph.Layout.Spring.prototype = {
     },
 
     layoutRepulsive: function(node1, node2) {
+        if (typeof node1 == 'undefined' || typeof node2 == 'undefined')
+            return;
         var dx = node2.layoutPosX - node1.layoutPosX;
         var dy = node2.layoutPosY - node1.layoutPosY;
         var d2 = dx * dx + dy * dy;