Merge branch '4.1'

* 4.1:
  SCA: removed unused variables
  Remove duplicate condition
  fix useless space in docblock
  remove unneeded tearDown method
  [Intl] Update the ICU data to 63.1
  [FrameworkBundle] Fix broken exception message
  [Messenger] send using the routing_key for AMQP transport
  also clean away the NO_AUTO_CACHE_CONTROL_HEADER if we have no session
  [TwigBundle] Fix usage of TwigBundle without FrameworkBundle
  Revert "fixed CS"
  [Serializer] Reduce class discriminator overhead
  Skip empty proxy code
  [Security] Fix "exclude-from-classmap"
  [Security] Removed unsed trait import
  [Config] Fix @method annotation
  add missing double-quotes to extra_fields output message
  [DI] Default undefined env to empty string during compile
  Convert InsufficientAuthenticationException to HttpException

Author: nicolas-grekas

Transport/AmqpExt/Connection.php

@@ -102,7 +102,7 @@ public function publish(string $body, array $headers = array()): void
             $this->setup();
         }
 
-        $this->exchange()->publish($body, null, AMQP_NOPARAM, array('headers' => $headers));
+        $this->exchange()->publish($body, $this->queueConfiguration['routing_key'] ?? null, AMQP_NOPARAM, array('headers' => $headers));
     }
 
     /**