Verify if a WMS layer exists or not in GeoServer (OpenLayers3)

WMSsource = new ol.layer.Image({
    source: new ol.source.ImageWMS({
        url: 'http://localhost:8080/geoserver/alger_data/wms',
        params: {
            'LAYERS': 'alger_data:hotel'
        },
        serverType: 'geoserver',
        crossOrigin: "Anonymous",
        outputFormat: "application/json",
    })
});

map.addLayer(WMSsource);