From f1d7600c347203224ff311a6deb4ac4c08a24fc2 Mon Sep 17 00:00:00 2001
From: Andrew Dunham <andrew@du.nham.ca>
Date: Tue, 14 Apr 2015 16:57:57 -0700
Subject: [PATCH] Fix Err fallout for graph/iterator.Null iterator

---
 graph/iterator/iterator.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/graph/iterator/iterator.go b/graph/iterator/iterator.go
index 6495de0..e822e55 100644
--- a/graph/iterator/iterator.go
+++ b/graph/iterator/iterator.go
@@ -88,6 +88,10 @@ func (it *Null) Next() bool {
 	return false
 }
 
+func (it *Null) Err() error {
+	return nil
+}
+
 func (it *Null) Result() graph.Value {
 	return nil
 }