Errors while trying to configure when edge is not found.

Artir found this bug, instead of causing huge errors it should instead try and display an error to the user.

artir@JosePC:~$ nautilus
(nautilus:23060): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
Initializing groundcontrol-1.5.1 extension
Initializing nautilus-gdu extension
/usr/lib/pymodules/python2.6/GroundControl/gtkviews.py:87: GtkWarning: gtk_widget_grab_default: assertion `GTK_WIDGET_CAN_DEFAULT (widget)' failed
  self.w_tree.add_from_file(self.gapp_xml)
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/GroundControl/gtkviews.py", line 224, in apply_changes
    self.destroy_window()
  File "/usr/lib/pymodules/python2.6/GroundControl/gtkviews.py", line 251, in destroy_window
    self._exiting(widget)
  File "/usr/lib/pymodules/python2.6/GroundControl/configuration.py", line 274, in _exiting
    super(LpLoginWindow, self)._exiting(*args, **kwargs)
  File "/usr/lib/pymodules/python2.6/GroundControl/gtkviews.py", line 257, in _exiting
    self.callback(**self._args)
  File "/usr/lib/pymodules/python2.6/GroundControl/configuration.py", line 237, in login
    self.lpweb.login(password)
  File "/usr/lib/pymodules/python2.6/GroundControl/launchpadweb.py", line 163, in login
    data=details)
  File "/usr/lib/pymodules/python2.6/GroundControl/launchpadweb.py", line 217, in request
    headers=headers, body=body )
  File "/usr/lib/pymodules/python2.6/httplib2/__init__.py", line 1068, in request
    (response, content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)
  File "/usr/lib/pymodules/python2.6/httplib2/__init__.py", line 872, in _request
    (response, content) = self._conn_request(conn, request_uri, method, body, headers)
  File "/usr/lib/pymodules/python2.6/httplib2/__init__.py", line 845, in _conn_request
    raise ServerNotFoundError("Unable to find the server at %s" % conn.host)
httplib2.ServerNotFoundError: Unable to find the server at edge.launchpad.net
Created new window in existing browser session.
dsdsERROR:dbus.connection:Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 214, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/nautilus/extensions-2.0/python/nautilus-groundcontrol.py", line 184, in update_widget
    oldparent.hide()
AttributeError: 'NoneType' object has no attribute 'hide'
ERROR:dbus.connection:Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 214, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/nautilus/extensions-2.0/python/nautilus-groundcontrol.py", line 184, in update_widget
    oldparent.hide()
AttributeError: 'NoneType' object has no attribute 'hide'
ERROR:dbus.connection:Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 214, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/nautilus/extensions-2.0/python/nautilus-groundcontrol.py", line 184, in update_widget
    oldparent.hide()
AttributeError: 'NoneType' object has no attribute 'hide'
ERROR:dbus.connection:Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 214, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/nautilus/extensions-2.0/python/nautilus-groundcontrol.py", line 184, in update_widget
    oldparent.hide()
AttributeError: 'NoneType' object has no attribute 'hide'
ERROR:dbus.connection:Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 214, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/nautilus/extensions-2.0/python/nautilus-groundcontrol.py", line 184, in update_widget
    oldparent.hide()
AttributeError: 'NoneType' object has no attribute 'hide'
ERROR:dbus.connection:Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 214, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/nautilus/extensions-2.0/python/nautilus-groundcontrol.py", line 184, in update_widget
    oldparent.hide()
AttributeError: 'NoneType' object has no attribute 'hide'