From a0979fe66a8f505c5e57b12a1a153a8bb33fb1f5 Mon Sep 17 00:00:00 2001
From: Dana Hoffman <danahoffman@google.com>
Date: Wed, 10 Oct 2018 10:30:55 -0700
Subject: [PATCH] don't try to parse the source image if there is none

---
 google/resource_compute_instance_template.go | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/google/resource_compute_instance_template.go b/google/resource_compute_instance_template.go
index b47f469f..854616fd 100644
--- a/google/resource_compute_instance_template.go
+++ b/google/resource_compute_instance_template.go
@@ -689,15 +689,19 @@ func flattenDisks(disks []*computeBeta.AttachedDisk, d *schema.ResourceData, def
 	for _, disk := range disks {
 		diskMap := make(map[string]interface{})
 		if disk.InitializeParams != nil {
-			selfLink, err := resolvedImageSelfLink(defaultProject, disk.InitializeParams.SourceImage)
-			if err != nil {
-				return nil, errwrap.Wrapf("Error expanding source image input to self_link: {{err}}", err)
+			if disk.InitializeParams.SourceImage != "" {
+				selfLink, err := resolvedImageSelfLink(defaultProject, disk.InitializeParams.SourceImage)
+				if err != nil {
+					return nil, errwrap.Wrapf("Error expanding source image input to self_link: {{err}}", err)
+				}
+				path, err := getRelativePath(selfLink)
+				if err != nil {
+					return nil, errwrap.Wrapf("Error getting relative path for source image: {{err}}", err)
+				}
+				diskMap["source_image"] = path
+			} else {
+				diskMap["source_image"] = ""
 			}
-			path, err := getRelativePath(selfLink)
-			if err != nil {
-				return nil, errwrap.Wrapf("Error getting relative path for source image: {{err}}", err)
-			}
-			diskMap["source_image"] = path
 			diskMap["disk_type"] = disk.InitializeParams.DiskType
 			diskMap["disk_name"] = disk.InitializeParams.DiskName
 			diskMap["disk_size_gb"] = disk.InitializeParams.DiskSizeGb