Comment # 1 on bug 1159808 from Marcel Kuehlhorn

I was able to reproduce this in a VM, on a clean install `python2-gobject` is
missing, after installing that `blueberry-tray` is starting but the Bluetooth
settings don't open.

Starting blueberry-tray from a terminal gives:
```
~> blueberry-tray 

(python2:1873): Gtk-WARNING **: Failed to register client:
GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: Method "RegisterClient"
with signature "ss" on interface "org.xfce.Session.Manager" doesn't exist

Traceback (most recent call last):
  File "/usr/lib/blueberry/blueberry-tray.py", line 49, in do_startup
    self.update_icon_callback(None, None, None)
  File "/usr/lib/blueberry/blueberry-tray.py", line 65, in update_icon_callback
    self.update_connected_state()
  File "/usr/lib/blueberry/blueberry-tray.py", line 68, in
update_connected_state
    connected_devices = self.get_connected_devices()
  File "/usr/lib/blueberry/blueberry-tray.py", line 84, in
get_connected_devices
    default = self.model.get_value(iter, GnomeBluetooth.Column.DEFAULT)
TypeError: argument iter: Expected Gtk.TreeIter, but got __main__._ResultTuple
Traceback (most recent call last):
  File "/usr/lib/blueberry/blueberry-tray.py", line 65, in update_icon_callback
    self.update_connected_state()
  File "/usr/lib/blueberry/blueberry-tray.py", line 68, in
update_connected_state
    connected_devices = self.get_connected_devices()
  File "/usr/lib/blueberry/blueberry-tray.py", line 84, in
get_connected_devices
    default = self.model.get_value(iter, GnomeBluetooth.Column.DEFAULT)
TypeError: argument iter: Expected Gtk.TreeIter, but got __main__._ResultTuple
Traceback (most recent call last):
  File "/usr/lib/blueberry/blueberry-tray.py", line 65, in update_icon_callback
    self.update_connected_state()
  File "/usr/lib/blueberry/blueberry-tray.py", line 68, in
update_connected_state
    connected_devices = self.get_connected_devices()
  File "/usr/lib/blueberry/blueberry-tray.py", line 84, in
get_connected_devices
    default = self.model.get_value(iter, GnomeBluetooth.Column.DEFAULT)
TypeError: argument iter: Expected Gtk.TreeIter, but got __main__._ResultTuple
Traceback (most recent call last):
  File "/usr/lib/blueberry/blueberry-tray.py", line 65, in update_icon_callback
    self.update_connected_state()
  File "/usr/lib/blueberry/blueberry-tray.py", line 68, in
update_connected_state
    connected_devices = self.get_connected_devices()
  File "/usr/lib/blueberry/blueberry-tray.py", line 84, in
get_connected_devices
    default = self.model.get_value(iter, GnomeBluetooth.Column.DEFAULT)
TypeError: argument iter: Expected Gtk.TreeIter, but got __main__._ResultTuple
```