ObjXMPP  Check-in [014e7a9d68]

	}

	if ([delegate respondsToSelector: @selector(connection:didReceiveIQ:)])
		handled = [delegate connection: self
				  didReceiveIQ: iq];

	if (!handled) {
		OFString *from = [iq attributeForName: @"from"].stringValue;
		OFString *to = [iq attributeForName: @"to"].stringValue;
		XMPPJID *from = iq.from;
		XMPPJID *to = iq.to;
		OFXMLElement *error;

		[iq setType: @"error"];

		[iq removeAttributeForName: @"from"];
		[iq removeAttributeForName: @"to"];

		if (from != nil)
		iq.to = from;
		iq.from = to;
			[iq addAttributeWithName: @"to"
				     stringValue: from];
		if (to != nil)
			[iq addAttributeWithName: @"from"
				     stringValue: to];

		error = [OFXMLElement elementWithName: @"error"];
		[error addAttributeWithName: @"type"
				stringValue: @"cancel"];
		[error addChild:
		    [OFXMLElement elementWithName: @"service-unavailable"
					namespace: NS_STANZAS]];