From 50afee2a30d88f5829dec86fcdb205454929ea2c Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Mon, 12 Sep 2016 19:37:19 -0600
Subject: [PATCH] terraform: Diff.Empty should be true for nil Diff

---
 terraform/diff.go      | 4 ++++
 terraform/diff_test.go | 7 ++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/terraform/diff.go b/terraform/diff.go
index e0e097e80..86be4bb5a 100644
--- a/terraform/diff.go
+++ b/terraform/diff.go
@@ -72,6 +72,10 @@ func (d *Diff) RootModule() *ModuleDiff {
 
 // Empty returns true if the diff has no changes.
 func (d *Diff) Empty() bool {
+	if d == nil {
+		return true
+	}
+
 	for _, m := range d.Modules {
 		if !m.Empty() {
 			return false
diff --git a/terraform/diff_test.go b/terraform/diff_test.go
index 5234c6aaf..a9cb8b47b 100644
--- a/terraform/diff_test.go
+++ b/terraform/diff_test.go
@@ -7,7 +7,12 @@ import (
 )
 
 func TestDiffEmpty(t *testing.T) {
-	diff := new(Diff)
+	var diff *Diff
+	if !diff.Empty() {
+		t.Fatal("should be empty")
+	}
+
+	diff = new(Diff)
 	if !diff.Empty() {
 		t.Fatal("should be empty")
 	}