Fails with Ubuntu 16.04 sucrose

[tony37]

Activity upgraded to sugar3. V33 from repository throws an exception during initialization:

from sugar3.datastore import datastore

fails at dist-packages/dbus/connection.py line 400 in add_signal_receiver
self._require_main_loop()

RuntimeError: To make asynchronous calls, receive signals or export objects, D-Bus connections must be attached to a main loop by passing mainloop=... to the constructor or calling dbus.set_default_main_loop(...)