No error is shown when invalid command line option and app.help_config.print_help_on_error = false

[phatchman]

In the 0.14.0 compatible version, passing an invalid command line option e.g. -qq would print an error, even if app.help_config.print_help_on_error = false;

Now it silently exits.

I was able to recreate this on the short.zig demo by changing the run part to:

    app.help_config.print_help_on_error = false;
    return r.run(&app);

And then passing an invalid option.

In my application, I don't want the whole help shown if someone just mistypes an option. I want them to only get the full help list when they use -h / --help.

I've not tried to track down the source of the issue yet. But will do so if I can later.

[phatchman]

Easy fix. just a missing flush().