diff --git a/core/lib/Drupal/Core/Template/Loader/FilesystemLoader.php b/core/lib/Drupal/Core/Template/Loader/FilesystemLoader.php
index f909809..6317435 100644
--- a/core/lib/Drupal/Core/Template/Loader/FilesystemLoader.php
+++ b/core/lib/Drupal/Core/Template/Loader/FilesystemLoader.php
@@ -43,10 +43,19 @@ public function __construct($paths = array(), ModuleHandlerInterface $module_han
 
     foreach ($namespaces as $name => $path) {
       $templatesDirectory = $path . '/templates';
-      if (file_exists($templatesDirectory)) {
-        $this->addPath($templatesDirectory, $name);
-      }
+      $this->addPath($templatesDirectory, $name);
     }
   }
 
+  /**
+   * Adds a path where templates are stored.
+   *
+   * @param string $path A path where to look for templates
+   * @param string $namespace A path name
+   */
+  public function addPath($path, $namespace = self::MAIN_NAMESPACE) {
+    // Invalidate the cache.
+    $this->cache = array();
+    $this->paths[$namespace][] = rtrim($path, '/\\');
+  }
 }