Fix error detection when parsing profile picture message.

For users that don't have a profile picture when we request one we receive this answer from WhatsApp:
<iq type="error" from="NNNNNNNNNNN@s.whatsapp.net" id="get_picture_2">
    <error text="item-not-found" code="404">
    </error>
</iq>
Comment out dbus function call when dbus option commented out.

Otherwise we get a syntax error in Python 2.6.6.