This PR was merged into the 3.4 branch.Discussion----------[Debug] Wrap call to require_once in a try/catch| Q             | A| ------------- | ---| Branch?       | 3.4| Bug fix?      | yes| New feature?  | no| BC breaks?    | no| Deprecations? | no| Tests pass?   | yes| Fixed tickets |symfony/monolog-bundle#236| License       | MIT| Doc PR        |If the included file contains an error, it hides the real error. Thismakes debugging harder.How to reproduce:```composer create-project symfony/skeleton symfony-3.4 3.4cd symfony-3.4composer req monolog```Add to `monolog.yaml`:```yaml        elasticsearch:            type: "elasticsearch"            elasticsearch:                host: 'elasticsearch'                port: '9200'            index: 'ep_php_logs_dev'            level: 'debug'            tags: 'monolog.logger'            channels: ['!event']```This will fail because the the `\Elastica\Client` class does not exist.But this error will be hidden by the `ClassNotFoundFatalErrorHandler`because it will try to load the `Symfony\Component\Kernel\Client` andthis class extends `Symfony\Component\BrowserKit\Client`. The last oneis a soft dependency...---Before```Fatal error: Uncaught Error: Class 'Symfony\Component\BrowserKit\Client' not found in /tmp/symfony-3.4/vendor/symfony/http-kernel/Client.php:31```After:```Fatal error: Uncaught Symfony\Component\Debug\Exception\ClassNotFoundException: Attempted to load class "Client" from namespace "Elastica".Did you forget a "use" statement for another namespace? in /tmp/symfony-es/var/cache/dev/ContainerWXN4mS9/srcApp_KernelDevDebugContainer.php:303```<!--Replace this notice by a short README for your feature/bugfix. This will help peopleunderstand your PR and can be used as a start for the documentation.Additionally (seehttps://symfony.com/roadmap): - Bug fixes must be submitted against the lowest maintained branch where they apply   (lowest branches are regularly merged to upper ones so they get the fixes too). - Features and deprecations must be submitted against the master branch.-->Commits-------afb6e1e [Debug] Wrap call to require_once in a try/catch