Comment 1 for bug 642936

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/share/software-center/softwarecenter/backend/aptd.py", line 467, in on_transactions_changed
    trans = client.get_transaction(current)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/defer.py", line 510, in _deferable
    return func(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/errors.py", line 149, in _convert_dbus_exception
    return func(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/client.py", line 1038, in get_transaction
    trans.sync()
  File "/usr/lib/python2.6/dist-packages/aptdaemon/defer.py", line 510, in _deferable
    return func(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/errors.py", line 149, in _convert_dbus_exception
    return func(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/client.py", line 334, in sync
    sync_properties(properties)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/client.py", line 323, in sync_properties
    self._on_property_changed(property_name, value)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/client.py", line 291, in _on_property_changed
    self.emit("space-changed", value)
TypeError: could not convert type dbus.Double to (null) required for parameter 0