Merge pull request #141 from stof/remove_useless_listener

Avoid registering the strategy listener when it is useless

Author: dbu

DependencyInjection/HttplugExtension.php

@@ -420,6 +420,12 @@ private function configureAutoDiscoveryClients(ContainerBuilder $container, arra
             $asyncHttpClient = new Reference($asyncHttpClient);
         }
 
+        if (null === $httpClient && null === $asyncHttpClient) {
+            $container->removeDefinition('httplug.strategy');
+
+            return;
+        }
+
         $container
             ->getDefinition('httplug.strategy')
             ->addArgument($httpClient)