[bug] disabling nested handler leads to `ServiceNotFoundException` exception

[kaznovac]

consider this configuration (with streamed handler enabled: false, available from monolog-bundle: ^3.11||^4.0)

monolog:
    handlers:
        main:
            type:         fingers_crossed
            action_level: critical
            handler:      grouped
        grouped:
            type:    group
            members: [streamed, deduplicated] # <-- nested here --
        streamed:
            type:    stream
            path:    '%kernel.logs_dir%/%kernel.environment%.log'
            level:   debug
            enabled: false # <-- disabled nested handler --
        deduplicated:
            type:    deduplication
            handler: symfony_mailer
        symfony_mailer:
            type:         symfony_mailer
            from_email:   'error@example.com'
            to_email:     'error@example.com'
            subject:      'An Error Occurred! %%message%%'
            level:        debug
            formatter:    monolog.formatter.html
            content_type: text/html

following exception rises in runtime:

In CheckExceptionOnInvalidReferenceBehaviorPass.php line 119:
                                                                                                                                                                                     
  [Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException]                                                                                                         
  The service "monolog.handler.grouped" has a dependency on a non-existent service "monolog.handler.streamed". Did you mean this: "monolog.handler.deduplicated"?                                                                                                                                                                            
                                                                                                                                                                                     

Exception trace:
  at /var/www/vendor/symfony/dependency-injection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php:119
 Symfony\Component\DependencyInjection\Compiler\AbstractRecursivePass@anonymous\/var/www/vendor/symfony/dependency-injection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php:104$a8->processValue() at /var/www/vendor/symfony/dependency-injection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php:126
 Symfony\Component\DependencyInjection\Compiler\CheckExceptionOnInvalidReferenceBehaviorPass->throwServiceNotFoundException() at /var/www/vendor/symfony/dependency-injection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php:86
 Symfony\Component\DependencyInjection\Compiler\CheckExceptionOnInvalidReferenceBehaviorPass->processValue() at /var/www/vendor/symfony/dependency-injection/Compiler/AbstractRecursivePass.php:90
 Symfony\Component\DependencyInjection\Compiler\AbstractRecursivePass->processValue() at /var/www/vendor/symfony/dependency-injection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php:51
 Symfony\Component\DependencyInjection\Compiler\CheckExceptionOnInvalidReferenceBehaviorPass->processValue() at /var/www/vendor/symfony/dependency-injection/Compiler/AbstractRecursivePass.php:90
 Symfony\Component\DependencyInjection\Compiler\AbstractRecursivePass->processValue() at /var/www/vendor/symfony/dependency-injection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php:51
 Symfony\Component\DependencyInjection\Compiler\CheckExceptionOnInvalidReferenceBehaviorPass->processValue() at /var/www/vendor/symfony/dependency-injection/Compiler/AbstractRecursivePass.php:99
 Symfony\Component\DependencyInjection\Compiler\AbstractRecursivePass->processValue() at /var/www/vendor/symfony/dependency-injection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php:51
 Symfony\Component\DependencyInjection\Compiler\CheckExceptionOnInvalidReferenceBehaviorPass->processValue() at /var/www/vendor/symfony/dependency-injection/Compiler/AbstractRecursivePass.php:90
 Symfony\Component\DependencyInjection\Compiler\AbstractRecursivePass->processValue() at /var/www/vendor/symfony/dependency-injection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php:51
 Symfony\Component\DependencyInjection\Compiler\CheckExceptionOnInvalidReferenceBehaviorPass->processValue() at /var/www/vendor/symfony/dependency-injection/Compiler/AbstractRecursivePass.php:48
 Symfony\Component\DependencyInjection\Compiler\AbstractRecursivePass->process() at /var/www/vendor/symfony/dependency-injection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php:42
 Symfony\Component\DependencyInjection\Compiler\CheckExceptionOnInvalidReferenceBehaviorPass->process() at /var/www/vendor/symfony/dependency-injection/Compiler/Compiler.php:80
 Symfony\Component\DependencyInjection\Compiler\Compiler->compile() at /var/www/vendor/symfony/dependency-injection/ContainerBuilder.php:768
 Symfony\Component\DependencyInjection\ContainerBuilder->compile() at /var/www/vendor/symfony/http-kernel/Kernel.php:507
 Symfony\Component\HttpKernel\Kernel->initializeContainer() at /var/www/vendor/symfony/http-kernel/Kernel.php:772
 Symfony\Component\HttpKernel\Kernel->preBoot() at /var/www/vendor/symfony/http-kernel/Kernel.php:126
 Symfony\Component\HttpKernel\Kernel->boot() at /var/www/vendor/symfony/framework-bundle/Console/Application.php:190
 Symfony\Bundle\FrameworkBundle\Console\Application->registerCommands() at /var/www/vendor/symfony/framework-bundle/Console/Application.php:72
 Symfony\Bundle\FrameworkBundle\Console\Application->doRun() at /var/www/vendor/symfony/console/Application.php:175
 Symfony\Component\Console\Application->run() at /var/www/bin/console:29

[kaznovac]

note that disabling a handler can be easily and cleanly achieved through monolog's provided NoopHandler and NullHandler

[GromNaN]

Is the problem due to the fact that the logger is injected into a service? That is the normal way to use a logger, I agree.
Can you use optional service injection?

This feature was introduced in #482.