From 54164e7464ace26e2e042cd6e722979a68f195ee Mon Sep 17 00:00:00 2001
From: Pierre-Yves Chibon <pingou@pingoured.fr>
Date: Sep 28 2015 09:13:59 +0000
Subject: Only find similarity if there is a diff


---

diff --git a/pagure/ui/fork.py b/pagure/ui/fork.py
index 79e0831..13e209e 100644
--- a/pagure/ui/fork.py
+++ b/pagure/ui/fork.py
@@ -241,7 +241,8 @@ def request_pull(repo, requestid, username=None):
                 'Could not update this pull-request in the database',
                 'error')
 
-    diff.find_similar()
+    if diff:
+        diff.find_similar()
 
     form = pagure.forms.ConfirmationForm()