unity-tweak-tool crashed with TypeError in on_treeselection_gtk_theme_changed(): Argument 1 does not allow None as a value

[Katsiaris Simos]

I was trying to cvhange the icon theme since today it broke for some reason and when i hit default the program chrashed

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/UnityTweakTool/section/spaghetti/theme.py", line 113, in refresh
    gtkthemesel.select_iter(self.gtkthemes[gtktheme]['iter'])
KeyError: 'elementary'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/UnityTweakTool/section/spaghetti/theme.py", line 226, in on_treeselection_gtk_theme_changed
    self.ui['treeselection_window_theme'].select_iter(iter)
TypeError: Argument 1 does not allow None as a value

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: unity-tweak-tool 0.0.6
ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0
Uname: Linux 3.13.0-5-generic x86_64
ApportVersion: 2.13.2-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Jan 31 00:23:40 2014
ExecutablePath: /usr/bin/unity-tweak-tool
InstallationDate: Installed on 2014-01-23 (7 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140123)
InterpreterPath: /usr/bin/python3.3
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/unity-tweak-tool
PythonArgs: ['/usr/bin/unity-tweak-tool']
SourcePackage: unity-tweak-tool
Title: unity-tweak-tool crashed with TypeError in on_treeselection_gtk_theme_changed(): Argument 1 does not allow None as a value
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo video