Check server configuration in legacy front files #19520
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Description
It fixes #18149.
If the webserver is not configured correctly, it may serve GLPI front files directly, without executing them through the Symfony Kernel. In this case the autoloader will not be registered and it will probably fail with a blank 500 error page due to a
class not found
error.Adding a check and display a proper error message will help GLPI administrator to fix its configuration.