Shows system notification message via dbus.

        `title`
            Notification title.
        `message`
            Notification message.

def _dbus_notify(title, message):
    """ Shows system notification message via dbus.

        `title`
            Notification title.
        `message`
            Notification message.
        """

    try:
        # fetch main account manager interface
        bus = dbus.SessionBus()
        obj = bus.get_object('org.freedesktop.Notifications',
                             '/org/freedesktop/Notifications')
        if obj:
            iface = dbus.Interface(obj, 'org.freedesktop.Notifications')

            if iface:
                # dispatch notification message
                iface.Notify('Focus', 0, '', title, message, [], {}, 5)

    except dbus.exceptions.DBusException:
        pass