link Characters in ranking on Characters page

www/analytics/core/Tracker/Db/DbException.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * Piwik - Open source web analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+
+namespace Piwik\Tracker\Db;
+
+use Exception;
+
+/**
+ * Database Exception
+ *
+ */
+class DbException extends Exception
+{
+}