add: if (gtx->priv->stream == NULL) { g_value_set_boolean (value, FALSE); return; }
context: gtk_xine_get_metadata_bool (GtkXine *gtx, GtkXineMetadataType type,		GValue *value){	gboolean boolean;	g_value_init (value, G_TYPE_BOOLEAN);	switch (type)	{	case GTX_INFO_HAS_VIDEO:		boolean = xine_get_stream_info (gtx->priv->stream,				XINE_STREAM_INFO_HAS_VIDEO);		break;	case GTX_INFO_HAS_AUDIO:		boolean = xine_get_stream_info (gtx->priv->stream,				XINE_STREAM_INFO_HAS_AUDIO);		break;	default:		g_assert_not_reached ();	}	g_value_set_boolean (value, boolean);	return;}