Crashes if org.freedesktop.DockManager DBus is already owned

[Rico Tzschichholz]

Running docky and awn side by side, causes this crash.

david@david:~$ docky
[Info 02:05:05.624] Docky version: 2.1.0 bzr docky r1391 ppa
[Info 02:05:05.654] Kernel version: 2.6.32.22
[Info 02:05:05.655] CLR version: 2.0.50727.1433
[Error 02:05:06.025] [DBusManager] Bus Name 'org.freedesktop.DockManager' is already owned

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object
  at Docky.DBus.DBusManager.RegisterItem (Docky.Items.AbstractDockItem item) [0x00000]
  at Docky.Interface.DockWindow.RegisterItem (Docky.Items.AbstractDockItem item) [0x00000]
  at Docky.Interface.DockWindow.RegisterItemProvider (Docky.Items.AbstractDockItemProvider provider) [0x00000]
  at Docky.Interface.DockWindow.RegisterPreferencesEvents (IDockPreferences preferences) [0x00000]
  at Docky.Interface.DockWindow.set_Preferences (IDockPreferences value) [0x00000]
  at Docky.Interface.Dock..ctor (Docky.Interface.DockPreferences prefs) [0x00000]
  at Docky.DockController.CreateDocks () [0x00000]
  at Docky.DockController.Initialize () [0x00000]
  at Docky.Docky.Main (System.String[] args) [0x00000]

[Robert Dyer (psybers)]

Fixed in rev 1393.