[Users] empty popup text

[Robert Buckley]

Hi,

could anyone give me a tip how I can define a popup from my map to show a the 
text "no data"  when the popup is empty?

My code for the popup is here

// create the popup
var featureInfo = new OpenLayers.Control.WMSGetFeatureInfo({
    queryVisible: true,
    highlightOnly: true,
    maxFeatures: 2,
    layers: [layer_wea_f,layer_wea
        ,layer_suchraum_v1,layer_suchraum_v2
        ,layer_suchraum_v3,layer_suchraum_v4
        ,layer_tabu_wgs84
        ,layer_avifaun_brut,layer_avifaun_gast
        ,layer_biogas,layer_wasserkraft
        ,layer_kraftwerke]
});




featureInfo.events.on({
    getfeatureinfo: function(e) {
        new GeoExt.Popup({
            title: "INFO",
            width: 300,
            height : 200,
            autoHeight: true,
            layout: 'fit',
            bodyStyle: 'background-color:white;,font-size:14px;',
            autoScroll: true,
            maximizable: true,
            map: mapPanel.map,
            lonlat: mapPanel.map.getLonLatFromPixel(e.xy),
            html: e.text,
            anchored: true,
            shadow: true,
            listeners: {
                    close: function() {
                        // closing a popup destroys it, but our reference is 
truthy
                        popup = null;
                    }
                }

        }).show();
    }
});