godoc: bring back "indexing in progress" message
godoc: bring back "indexing in progress" message

A wrongly nested if prevented the message from appearing.

Fixes issue 1420.

R=r, r2
CC=golang-dev
http://codereview.appspot.com/3987043

wesolows/golang,firebitsbr/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang,wesolows/golang-old,wesolows/golang,wesolows/golang-old,wesolows/golang,wesolows/golang,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang-old