Add error dialog for map error during loading.

mindplot/src/main/javascript/Designer.js

@@ -447,7 +447,7 @@ mindplot.Designer = new Class({
             $assert(mindmapModel, "mindmapModel can not be null");
             this._mindmap = mindmapModel;
 
-//            try {
+            try {
             // Init layout manager ...
             var size = {width:25,height:25};
             var layoutManager = new mindplot.layout.LayoutManager(mindmapModel.getCentralTopic().getId(), size);
@@ -484,9 +484,9 @@ mindplot.Designer = new Class({
             mindplot.EventBus.instance.fireEvent(mindplot.EventBus.events.DoLayout);
 
             this.fireEvent('loadSuccess');
-//            } catch(e) {
-//                this.fireEvent('loadError', e);
-//            }
+            } catch(e) {
+                this.fireEvent('loadError', e);
+            }
         },
 
         getMindmap : function() {