"play" when rb is not running should not popup its window

Currently the "play" button is sound indicator is inconsistent. There is a confusion between music being a background service, or a traditional app. See for example those steps:

1) (rb is not yet running) click play in indicator, rb window popup and start playing
2) close the rb window, music is still playing, so I would consider music to be a service independent from its UI (even if technically it's not true)
3) I pause the music (now I'm conceptually in the same state than when I started the session, I'm not supposed to know that rb is actually still running)
4) click "play" again, it start playing but does not popup window

I think it 1) and 4) the same thing should happen. Either popup window in both cases, or don't.

I personally would prefer window not poping in step 1.

Related to this, taping the "play" multimedia key should have the same effect. This is https://bugzilla.gnome.org/show_bug.cgi?id=687831

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: indicator-sound 12.10.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-19.30-generic 3.5.7
Uname: Linux 3.5.0-19-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Thu Dec 6 10:44:51 2012
InstallationDate: Installed on 2012-09-29 (67 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20120929)
MarkForUpload: True
SourcePackage: indicator-sound
UpgradeStatus: No upgrade log present (probably fresh install)