[WebBundle] fixed Mustache... again

src/Symfony/Framework/WebBundle/Util/Mustache.php

@@ -38,7 +38,9 @@ class Mustache
     static public function renderDir($dir, $parameters)
     {
         foreach (new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($dir), \RecursiveIteratorIterator::LEAVES_ONLY) as $file) {
-            static::renderFile((string) $file, $parameters);
+            if ($file->isFile()) {
+                static::renderFile((string) $file, $parameters);
+            }
         }
     }
 }