Deprecate passing null as $message or $code to exceptions

Author: derrabus

Exception/MethodNotAllowedException.php

@@ -27,6 +27,12 @@ class MethodNotAllowedException extends \RuntimeException implements ExceptionIn
      */
     public function __construct(array $allowedMethods, ?string $message = '', int $code = 0, \Throwable $previous = null)
     {
+        if (null === $message) {
+            trigger_deprecation('symfony/routing', '5.3', 'Passing null as $message to "%s()" is deprecated, pass an empty string instead.', __METHOD__);
+
+            $message = '';
+        }
+
         $this->allowedMethods = array_map('strtoupper', $allowedMethods);
 
         parent::__construct($message, $code, $previous);