Merge branch '3.4' into 4.3

* 3.4:
  Fix inconsistent return points.
  Fix remaining tests

Author: nicolas-grekas

DependencyInjection/Configuration.php

@@ -225,7 +225,7 @@ private function addWorkflowSection(ArrayNodeDefinition $rootNode)
                     ->canBeEnabled()
                     ->beforeNormalization()
                         ->always(function ($v) {
-                            if (true === $v['enabled']) {
+                            if (\is_array($v) && true === $v['enabled']) {
                                 $workflows = $v;
                                 unset($workflows['enabled']);