fixed bug where error message pops up when user closes out of app through close button rather than file -> exit

Author: calvincao

app/electron/main.js

@@ -124,7 +124,6 @@ async function createWindow() {
     // Dereference the window object, usually you would store windows
     // in an array if your app supports multi windows, this is the time
     // when you should delete the corresponding element.
-    // win = null;
     app.quit();
   });