modified ModelTest for strict PHP standarts

tests/model/ModelTest.php

@@ -279,7 +279,7 @@ abstract class MyDbDriver extends DbDriver
         return $table;
     }
 
-    public function query($sql, $params)
+    public function query($sql, $params = array())
     {
         $conf = array('driver' => 'MockDbDriver', 'hostname' => 'localhost', 'database' => 'db', 'username' => 'test', 'password' => '1234');
         return new MockDbDriver($conf);