From 14bd6dd277bd5d70a716a7723290de45d76b03ab Mon Sep 17 00:00:00 2001
From: qsm-odoo <qsm@odoo.com>
Date: Wed, 27 Sep 2017 16:12:36 +0200
Subject: [PATCH] [FIX] web: traceback on line graphs with only one data

Graph tooltip destruction was fixed with commit https://github.com/odoo/odoo/commit/86252428846607cd5f4b18cef8de49a8cd0b151a#diff-5de06eee7a2eeae066aa1348a1528fe9L100.
Unfortunately, the commit supposed that the 'display_' methods always
returned a graph, which is wrong.

opw-773759
---
 addons/web/static/src/js/views/graph_widget.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/addons/web/static/src/js/views/graph_widget.js b/addons/web/static/src/js/views/graph_widget.js
index 73b9c6be406..8e6a574a35d 100644
--- a/addons/web/static/src/js/views/graph_widget.js
+++ b/addons/web/static/src/js/views/graph_widget.js
@@ -98,7 +98,9 @@ return Widget.extend({
             }));
         } else {
             var chart = this['display_' + this.mode]();
-            chart.tooltip.chartContainer(this.$el[0]);
+            if (chart) {
+                chart.tooltip.chartContainer(this.$el[0]);
+            }
         }
     },
     display_bar: function () {