fix UT。review by songyumeng.

tangqinGiser · tangqinGiser · commit 55e0355d46ae · 2018-03-23T17:06:23.000+08:00
diff --git a/dist/iclient9-openlayers.js b/dist/iclient9-openlayers.js
@@ -59874,7 +59874,7 @@ var MapExtend = exports.MapExtend = function () {
 
         this.forEachFeatureAtPixelDefault(pixel, callback, opt_options);
 
-        var layerFilter = opt_options.layerFilter ? opt_options.layerFilter : function () {
+        var layerFilter = opt_options && opt_options.layerFilter ? opt_options.layerFilter : function () {
             return true;
         };
 
diff --git a/dist/iclient9-openlayers.min.js b/dist/iclient9-openlayers.min.js
diff --git a/src/openlayers/core/MapExtend.js b/src/openlayers/core/MapExtend.js
@@ -12,7 +12,7 @@ export var MapExtend = function () {
 
         this.forEachFeatureAtPixelDefault(pixel, callback, opt_options);
 
-        const layerFilter = opt_options.layerFilter ? opt_options.layerFilter : () => {
+        const layerFilter = (opt_options && opt_options.layerFilter) ? opt_options.layerFilter : () => {
             return true;
         };
 
