autopilot vis crashed with StateNotFoundError in get_new_state(): State not found for class with name 'ApplicationLauncherIcon' and id '237142'.

[Jean-Baptiste Lallement]

TEST CASE:
1. Launch gedit
2. Launch autopilot vis
3. Select unity in the connection list of autopilot vis
4. In the widget tree go to LauncherController/LaunchModel
5. Browse the list of ApplicationLauncherIcon and verify that gedit is listed
6. Close gedit
7. Browser ApplicationLauncherIcon objects again

ACTUAL RESULT:
This crash, the entry for gedit it still displayed in the list but properties are empty

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: python-autopilot 1.3.1+13.10.20130830-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-7.13-generic 3.11.0
Uname: Linux 3.11.0-7-generic x86_64
ApportVersion: 2.12.1-0ubuntu3
Architecture: amd64
Date: Thu Sep 12 10:55:50 2013
ExecutablePath: /usr/bin/autopilot
InstallationDate: Installed on 2013-09-03 (8 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130902)
InterpreterPath: /usr/bin/python2.7
MarkForUpload: True
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/autopilot vis
PythonArgs: ['/usr/bin/autopilot', 'vis']
SourcePackage: autopilot
Title: autopilot crashed with StateNotFoundError in get_new_state(): State not found for class with name 'ApplicationLauncherIcon' and id '237142'.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm autopilot cdrom dip lpadmin plugdev sambashare sudo