Fix for Title bar text and Save button issue for empty active pane (#14421)

* Adding null checks to fix title change issue

* Change the menu items visibility when file is present in active pane

* Enable Menu options when no file is present in active pane

Author: sobisht

src/document/DocumentCommandHandlers.js

@@ -158,8 +158,8 @@ define(function (require, exports, module) {
         var currentDoc          = DocumentManager.getCurrentDocument(),
             windowTitle         = brackets.config.app_title,
             currentlyViewedFile = MainViewManager.getCurrentlyViewedFile(MainViewManager.ACTIVE_PANE),
-            currentlyViewedPath = currentlyViewedFile.fullPath,
-            readOnlyString      = currentlyViewedFile.readOnly ? "[Read Only] - " : "";
+            currentlyViewedPath = currentlyViewedFile && currentlyViewedFile.fullPath,
+            readOnlyString      = (currentlyViewedFile && currentlyViewedFile.readOnly) ? "[Read Only] - " : "";
 
         if (!brackets.nativeMenus) {
             if (currentlyViewedPath) {

src/extensions/default/RemoteFileAdapter/main.js

@@ -59,7 +59,8 @@ define(function (require, exports, module) {
     function _setMenuItemsVisible() {
         var file = MainViewManager.getCurrentlyViewedFile(MainViewManager.ACTIVE_PANE),
             cMenuItems = [Commands.FILE_SAVE, Commands.FILE_RENAME, Commands.NAVIGATE_SHOW_IN_FILE_TREE, Commands.NAVIGATE_SHOW_IN_OS],
-            enable = (file.constructor.name !== "RemoteFile");
+            // Enable menu options when no file is present in active pane
+            enable = !file || (file.constructor.name !== "RemoteFile");
 
             // Enable or disable commands based on whether the file is a remoteFile or not.
             cMenuItems.forEach(function (item) {