MOBILE-2478 desktop: Prevent errors when calling close in closed windows

desktop/electron.js

@@ -184,10 +184,11 @@ ipcMain.on('openItem', (event, path) => {
 });
 
 ipcMain.on('closeSecondaryWindows', () => {
-    var windows = BrowserWindow.getAllWindows();
-    for (var i = 0; i < windows.length; i++) {
-        if (!mainWindow || windows[i].id != mainWindow.id) {
-            windows[i].close();
+    const windows = BrowserWindow.getAllWindows();
+    for (let i = 0; i < windows.length; i++) {
+        const win = windows[i];
+        if (!win.isDestroyed() && (!mainWindow || win.id != mainWindow.id)) {
+            win.close();
         }
     }
 });

src/core/emulator/classes/inappbrowserobject.ts

@@ -94,7 +94,16 @@ export class InAppBrowserObjectMock {
      * Close the window.
      */
     close(): void {
+        if (this.window.isDestroyed()) {
+            // Window already closed, nothing to do.
+            return;
+        }
+
+        try {
             this.window.close();
+        } catch (ex) {
+            // Ignore errors.
+        }
     }
 
     /**