Merge branch '4.4'

* 4.4:
  [HttpKernel] fix wrong removal of the just generated container dir
  bug #34024 [Routing] fix route loading with wildcard, but dir or file is empty (gseidel)
  [Routing] fix route loading with wildcard, but dir or file is empty
  bump Form component compatibility versions
  execute all compatible tests across versions
  [Mailer][MailchimpBridge] Fix NamedAddress obsolete paths

Author: fabpot

Loader/Configurator/RoutingConfigurator.php

@@ -36,7 +36,8 @@ public function __construct(RouteCollection $collection, PhpFileLoader $loader,
     final public function import($resource, string $type = null, bool $ignoreErrors = false): ImportConfigurator
     {
         $this->loader->setCurrentDir(\dirname($this->path));
-        $imported = $this->loader->import($resource, $type, $ignoreErrors, $this->file);
+        $imported = $this->loader->import($resource, $type, $ignoreErrors, $this->file) ?: [];
+
         if (!\is_array($imported)) {
             return new ImportConfigurator($this->collection, $imported);
         }

Loader/XmlFileLoader.php

@@ -166,7 +166,7 @@ protected function parseImport(RouteCollection $collection, \DOMElement $node, s
         $this->setCurrentDir(\dirname($path));
 
         /** @var RouteCollection[] $imported */
-        $imported = $this->import($resource, ('' !== $type ? $type : null), false, $file);
+        $imported = $this->import($resource, ('' !== $type ? $type : null), false, $file) ?: [];
 
         if (!\is_array($imported)) {
             $imported = [$imported];

Loader/YamlFileLoader.php

@@ -185,7 +185,7 @@ protected function parseImport(RouteCollection $collection, array $config, strin
 
         $this->setCurrentDir(\dirname($path));
 
-        $imported = $this->import($config['resource'], $type, false, $file);
+        $imported = $this->import($config['resource'], $type, false, $file) ?: [];
 
         if (!\is_array($imported)) {
             $imported = [$imported];

Tests/Fixtures/controller/empty_wildcard/.gitignore

@@ -5,3 +5,7 @@ api:
     resource: ../controller/routing.yml
     name_prefix: api_
     prefix: /api
+
+empty_wildcard:
+    resource: ../controller/empty_wildcard/*
+    prefix: /empty_wildcard