From d66de2a46797f826edd75c7248fc33ba266bf401 Mon Sep 17 00:00:00 2001
From: Andrean Franc <andrean.franc@gmail.com>
Date: Fri, 23 Oct 2015 14:41:30 +0200
Subject: [PATCH] Fix unhelpful None error message when templates are not found

---
 librarian_core/contrib/system/routes.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/librarian_core/contrib/system/routes.py b/librarian_core/contrib/system/routes.py
index a257a96..1dc4171 100644
--- a/librarian_core/contrib/system/routes.py
+++ b/librarian_core/contrib/system/routes.py
@@ -36,12 +36,13 @@ def error_404(exc):
 
 @view('errors/500')
 def error_500(exc):
+    traceback = exc.traceback or exc.body
     logging.error("Unhandled error '%s' at %s %s:\n\n%s",
                   exc.exception,
                   request.method.upper(),
                   request.path,
-                  exc.traceback)
-    return dict(trace=exc.traceback)
+                  traceback)
+    return dict(trace=traceback)
 
 
 @view('errors/503')