Respect parent setting, handling exceptions

[GeoSot]

I just fell in a case where I had the following code, that always have to return result or exception, and during some commands execution, I was leading to nothing.

    $application = new Application();
    $application->setAutoExit(false);
    $application->setCatchExceptions(false);
    $input = new StringInput($command);

        try {    
            $exitCode = $application->run($input, $this->getOutput());
        } catch (\Exception $exception) {
            $this->error($exception->getMessage());
            $exitCode = 1;
        } finally {
            return $this->printResult($exitCode, $command);
        }

Debugging the code, it lead me to this error:

Composer could not find a composer.json file in /app/public
To initialize a project, please create a composer.json file as described in the https://getcomposer.org/ "Getting Started" section

Although, it wasn't possible to get it, as the code exits, ignoring the parent setting

[Seldaek]

Thanks

[PhilETaylor]

This PR broke things :) see #10022 :)