From bd41831f66837f59428ae824b33979db9eaaf30c Mon Sep 17 00:00:00 2001
From: Robert Griesemer <gri@golang.org>
Date: Fri, 3 Feb 2012 08:33:29 -0800
Subject: [PATCH] godoc: diagnostic for empty FS tree

R=adg
CC=golang-dev
https://golang.org/cl/5615055
---
 src/cmd/godoc/godoc.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/cmd/godoc/godoc.go b/src/cmd/godoc/godoc.go
index a4a0d8333c..34e058ab5c 100644
--- a/src/cmd/godoc/godoc.go
+++ b/src/cmd/godoc/godoc.go
@@ -114,7 +114,12 @@ func registerPublicHandlers(mux *http.ServeMux) {
 }
 
 func initFSTree() {
-	fsTree.set(newDirectory(filepath.Join(*goroot, *testDir), nil, -1))
+	dir := newDirectory(filepath.Join(*goroot, *testDir), nil, -1)
+	if dir == nil {
+		log.Println("Warning: FSTree is nil")
+		return
+	}
+	fsTree.set(dir)
 	invalidateIndex()
 }