From 772fb911c42e1869181131d566d04d731589c2c8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Sun, 15 Jan 2017 02:38:57 +0100
Subject: [PATCH] Use timedelta as start of sum of lead times

The sum was introduced in changeset 253b1d2fb43a
---
 location.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/location.py b/location.py
index 87fa8d855e..a98bcd7bd8 100644
--- a/location.py
+++ b/location.py
@@ -38,7 +38,9 @@ class LocationLeadTime:
         lead_time = datetime.timedelta(0)
         lead_times = cls.search([])
         if lead_times:
-            lead_time = sum(r.lead_time for r in lead_times if r.lead_time)
+            lead_time = sum(
+                (r.lead_time for r in lead_times if r.lead_time),
+                datetime.timedelta(0))
         extra_lead_times = cls._get_extra_lead_times()
         if extra_lead_times:
             lead_time += max(extra_lead_times)