Launcher key only works with desktop icons turned on

Pressing the, for lack of a better word, "windows key" to show the unity launcher menu will only work if either there is an active window in the current workspace, or the "display desktop icons" option has been turned on in the unity tweak tool.

Steps to reproduce:

1) Install the unity tweak tool
2) Under System -> Desktop icons, uncheck "Show desktop icons"
3) Close all windows, or navigate to an empty workspace
4) Press the super key all you want.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: unity 7.0.0daily13.04.18~13.04-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-21.32-generic 3.8.8
Uname: Linux 3.8.0-21-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Mon May 20 19:41:58 2013
InstallationDate: Installed on 2013-04-27 (23 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)