Merge branch '3.4' into 4.3

* 3.4:
  bug #34024 [Routing] fix route loading with wildcard, but dir or file is empty (gseidel)

Author: nicolas-grekas

Loader/Configurator/RoutingConfigurator.php

@@ -39,7 +39,7 @@ public function __construct(RouteCollection $collection, PhpFileLoader $loader,
     final public function import($resource, $type = null, $ignoreErrors = false)
     {
         $this->loader->setCurrentDir(\dirname($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

@@ -169,7 +169,7 @@ protected function parseImport(RouteCollection $collection, \DOMElement $node, $
         $this->setCurrentDir(\dirname($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

@@ -187,7 +187,7 @@ protected function parseImport(RouteCollection $collection, array $config, $path
 
         $this->setCurrentDir(\dirname($path));
 
-        $imported = $this->import($config['resource'], $type, false, $file) ?? [];
+        $imported = $this->import($config['resource'], $type, false, $file) ?: [];
 
         if (!\is_array($imported)) {
             $imported = [$imported];