Impossible to select only DVD drive as source when trying to make an ISO

[Sah Lee]

To reproduce:
1. Insert a DVD to your only drive.
2. Open Brasero, select "Disc copy".
3. Try select the DVD you just inserted from the upper drop-down list.

Expected:
The DVD is selected and then you can input a destination for the ISO to make.

Actually:
Brasero just won't let you select the DVD.

I don't have an environment with more than one drive to test whether this is triggered by having one only drive installed.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: brasero 3.6.1-0ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-30.44-generic 3.8.13.6
Uname: Linux 3.8.0-30-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
Date: Mon Sep 16 11:49:15 2013
InstallationDate: Installed on 2012-08-12 (400 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: brasero
UpgradeStatus: Upgraded to raring on 2013-04-26 (142 days ago)