hide map for Character groups Quest Stations when there are no stations

www/analytics/core/Translate/Validate/ValidateAbstract.php

@@ -0,0 +1,37 @@
+<?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\Translate\Validate;
+
+/**
+ */
+abstract class ValidateAbstract
+{
+    protected $message = null;
+
+    /**
+     * Returns if the given translations are valid
+     *
+     * @param array $translations
+     *
+     * @return boolean
+     */
+    abstract public function isValid($translations);
+
+    /**
+     * Returns an array of messages that explain why the most recent isValid()
+     * call returned false.
+     *
+     * @return array
+     */
+    public function getMessage()
+    {
+        return $this->message;
+    }
+}