getTopOverviewImage cannot return null

frontend-js/src/main/js/gui/topMenu/TopMenu.js

@@ -10,6 +10,7 @@ var OverviewDialog = require('../OverviewDialog');
 var PanelControlElementType = require('../PanelControlElementType');
 
 var Functions = require('../../Functions');
+// noinspection JSUnusedLocalSymbols
 var logger = require('../../logger');
 
 /**
@@ -187,16 +188,15 @@ TopMenu.prototype.init = function () {
   commentCheckbox.onclick = function () {
     ServerConnector.getSessionData(project).setShowComments(commentCheckbox.checked);
     if (commentCheckbox.checked) {
-      $(refreshCommentButton).css("display","inline");
+      $(refreshCommentButton).css("display", "inline");
     } else {
-      $(refreshCommentButton).css("display","none");
+      $(refreshCommentButton).css("display", "none");
     }
     return self.getMap().refreshComments().then(null, GuiConnector.alert);
   };
   refreshCommentButton.onclick = (function () {
     return function () {
-      self.getMap().refreshComments();
-      return false;
+      return self.getMap().refreshComments();
     };
   })();
 
@@ -207,16 +207,18 @@ TopMenu.prototype.init = function () {
     };
   })();
 
-  if (project.getTopOverviewImage() !== undefined && project.getTopOverviewImage() !== null) {
+  if (project.getTopOverviewImage() !== undefined) {
     self._overviewDialog = new OverviewDialog({
       customMap: self.getMap(),
+      configuration: self.getConfiguration(),
+      project: self.getProject(),
       element: self.getControlElement(PanelControlElementType.OVERVIEW_DIALOG_DIV)
     });
     var showOverviewButton = self.getControlElement(PanelControlElementType.MENU_SHOW_OVERVIEW_BUTTON);
     showOverviewButton.onclick = function () {
       return self._overviewDialog.showOverview();
     };
-    $(showOverviewButton).css("display","inline-block");
+    $(showOverviewButton).css("display", "inline-block");
   }
 
   if (ServerConnector.getSessionData().getShowComments()) {