Merge pull request #12 from phansys/child_admin

Avoid to show the transition if the current admin is not the one which transition applies to

src/Admin/Extension/WorkflowExtension.php

@@ -72,7 +72,7 @@ public function configureSideMenu(
         $action,
         AdminInterface $childAdmin = null
     ) {
-        if (!in_array($action, $this->options['render_actions'], true)) {
+        if (null !== $childAdmin || !in_array($action, $this->options['render_actions'], true)) {
             return;
         }