E_ALL fix for mail_fetch

plugins/mail_fetch/options.php

@@ -26,6 +26,9 @@ require_once(SM_PATH . 'include/load_prefs.php');
     if(isset($_POST['mf_cypher'])) {
         $mf_cypher = $_POST['mf_cypher'];
     }
+    else {
+        $mf_cyper = '';
+    }
     if(isset($_POST['mf_sn'])) {
         $mf_sn = $_POST['mf_sn'];
     }