From 05d4bcb987179e60007fbd6f9378870a2d396ba1 Mon Sep 17 00:00:00 2001
From: Christian Flothmann <christian.flothmann@sensiolabs.de>
Date: Mon, 25 Jun 2018 17:34:31 +0200
Subject: [PATCH] fix handling of empty DI extension configs

---
 .../Compiler/ValidateEnvPlaceholdersPass.php                    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ValidateEnvPlaceholdersPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ValidateEnvPlaceholdersPass.php
index 402aca6378..06b655328b 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ValidateEnvPlaceholdersPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ValidateEnvPlaceholdersPass.php
@@ -65,7 +65,7 @@ class ValidateEnvPlaceholdersPass implements CompilerPassInterface
             $processor = new Processor();
 
             foreach ($extensions as $name => $extension) {
-                if (!$extension instanceof ConfigurationExtensionInterface || !$config = $container->getExtensionConfig($name)) {
+                if (!$extension instanceof ConfigurationExtensionInterface || !$config = array_filter($container->getExtensionConfig($name))) {
                     // this extension has no semantic configuration or was not called
                     continue;
                 }