logger is not yet present. Don't check for it's existance, but ignore if missing

Author: alexbumbacea

DependencyInjection/OldSoundRabbitMqExtension.php

@@ -3,6 +3,7 @@
 namespace OldSound\RabbitMqBundle\DependencyInjection;
 
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
@@ -511,9 +512,7 @@ private function injectLogger(Definition $definition)
         $definition->addTag('monolog.logger', array(
             'channel' => 'phpamqplib'
         ));
-        if ($this->container->has('logger')) {
-            $definition->addMethodCall('setLogger', array(new Reference('logger')));
-        }
+        $definition->addMethodCall('setLogger', array(new Reference('logger', ContainerInterface::IGNORE_ON_INVALID_REFERENCE)));
     }
 
     /**