Issue #1914932 by swentel: Fixed Config staging directory needs a .htaccess file.

core/includes/file.inc

@@ -526,6 +526,7 @@ function file_ensure_htaccess() {
   }
   file_save_htaccess('temporary://', TRUE);
   file_save_htaccess(config_get_config_directory(), TRUE);
+  file_save_htaccess(config_get_config_directory(CONFIG_STAGING_DIRECTORY), TRUE);
 }
 
 /**