Packaged MacOS App does not start with Finder double-Click

[mutex1980]

The tutorial is great and completely worked for me. If I go one step further and bundle a MacOS app with:

electron-packager . <app_name>,

the generated app can be started from terminal with:

open <app_name>.app.

But if it is double clicked from Finder the app launches but the main window does not show up.