only set popup content if values are defined

git-svn-id: http://svn.openlayers.org/trunk/openlayers@455 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Text.js

@@ -9,6 +9,7 @@ OpenLayers.Layer.Text.prototype =
     /** store url of text file
     * @type str */
     location:null,
+
     /**
     * @constructor
     *
@@ -74,7 +75,6 @@ OpenLayers.Layer.Text.prototype =
                     }
                     if (set) {
                       var data = new Object();
-                      
                       if (url != null) {
                           data.icon = new OpenLayers.Icon(url, 
                                                           iconSize, 
@@ -90,7 +90,9 @@ OpenLayers.Layer.Text.prototype =
                           }
                         
                       }
+                      if ((title != null) && (description != null)) {
                           data['popupContentHTML'] = '<h2>'+title+'</h2><p>'+description+'</p>';
+                      }
                       var feature = new OpenLayers.Feature(this, location, data);
                       var marker = feature.createMarker();
                       marker.events.register('click', feature, this.markerClick);