From 7e52f6ce6e48d458f419a75015382cd4bdfe69b7 Mon Sep 17 00:00:00 2001
From: Barak Michener <me@barakmich.com>
Date: Wed, 25 Jun 2014 17:39:40 -0400
Subject: [PATCH] Indexing into an empty fixed iterator for logging purposes no
 longer crashes. Fixes #3.

---
 src/graph/fixed-iterator.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/graph/fixed-iterator.go b/src/graph/fixed-iterator.go
index 3b82586..7578611 100644
--- a/src/graph/fixed-iterator.go
+++ b/src/graph/fixed-iterator.go
@@ -84,12 +84,17 @@ func (f *FixedIterator) AddValue(v TSVal) {
 
 // Print some information about the iterator.
 func (f *FixedIterator) DebugString(indent int) string {
+	value := ""
+	if len(f.values) > 0 {
+		value = fmt.Sprint(f.values[0])
+	}
 	return fmt.Sprintf("%s(%s tags: %s Size: %d id0: %d)",
 		strings.Repeat(" ", indent),
 		f.Type(),
 		f.FixedTags(),
 		len(f.values),
-		f.values[0])
+		value,
+	)
 }
 
 // Register this iterator as a Fixed iterator.