[ticket/12610] Correctly handle empty cache

PHPBB3-12610

phpBB/phpbb/exception/version_check_exception.php

@@ -0,0 +1,21 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\exception;
+
+/**
+ * Define an exception related to the version checker.
+ */
+class version_check_exception extends runtime_exception
+{
+}