add file without ns

Author: TomasVotruba

src/PhpParser/Enum/NodeGroup.php

@@ -26,6 +26,7 @@
 use PhpParser\Node\Stmt\Trait_;
 use PhpParser\Node\Stmt\TryCatch;
 use PhpParser\Node\Stmt\While_;
+use Rector\PhpParser\Node\CustomNode\FileWithoutNamespace;
 
 final class NodeGroup
 {
@@ -52,6 +53,7 @@ final class NodeGroup
         Namespace_::class,
         TryCatch::class,
         While_::class,
+        FileWithoutNamespace::class,
     ];
 
     /**