From 8c2881265448701dfcef9c94276f33609c50b2f9 Mon Sep 17 00:00:00 2001
From: Correl Roush <correl@gmail.com>
Date: Fri, 19 Nov 2010 15:06:34 -0500
Subject: [PATCH] Handle empty blobs when diffing

---
 lib/vcs.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/vcs.py b/lib/vcs.py
index 4c2aa35..7b72e8a 100644
--- a/lib/vcs.py
+++ b/lib/vcs.py
@@ -37,8 +37,8 @@ class Diff(object):
         diff = difflib.unified_diff(
                 a,
                 b,
-                fromfile=self.a.path,
-                tofile=self.b.path,
+                fromfile=self.a.path if self.a else '/dev/null',
+                tofile=self.b.path if self.b else '/dev/null',
                 n=context,
                 lineterm='')
         return "\n".join(diff)