Restore possibility to run without mainloop

Author: AndersBlomdell

NetworkManager.py

@@ -258,7 +258,8 @@ def __eq__(self, other):
     @property
     def proxy(self):
         if not self._proxy:
-            self._proxy = dbus.SystemBus().get_object(self.dbus_service, self.object_path, follow_name_owner_changes=True)
+            self._proxy = dbus.SystemBus().get_object(self.dbus_service, self.object_path,
+                                                      follow_name_owner_changes=dbus.get_default_main_loop() != None)
             self._proxy.created = time.time()
         elif self._proxy.created < self.last_disconnect:
             if self.is_transient: