Handle PHP Fatal Error

[joshbetz]

When WP-CLI encounters a fatal error, it reports the fatal error and exits. VIP CLI doesn't report the fatal error, it just exits silently. We can test with the following command:

WP_CLI::add_command( 'test fatal', function() {
    trigger_error( 'Fatal Error', E_USER_ERROR );
} );

This will likely include work in the API and Runner as well as the CLI repo. Off the top of my head, the issue may be that we're ignoring stderr.

Related #361

[github-actions]

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