If framework.messenger.buses.X.middleware is empty, it will be null

sroze · sroze · commit 91a70fcd6fb5 · 2018-10-25T11:45:27.000+02:00
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -1090,7 +1090,7 @@ function ($a) {
                                     ->end()
                                     ->arrayNode('middleware')
                                         ->beforeNormalization()
-                                            ->ifTrue(function ($v) { return \is_string($v) || !\is_int(key($v)); })
+                                            ->ifTrue(function ($v) { return \is_string($v) || (\is_array($v) && !\is_int(key($v))); })
                                             ->then(function ($v) { return array($v); })
                                         ->end()
                                         ->defaultValue(array())
