[2.0] Add Message to NoResultException

lib/Doctrine/ORM/NoResultException.php

@@ -8,4 +8,10 @@ namespace Doctrine\ORM;
  * @author robo
  * @since 2.0
  */
-class NoResultException extends ORMException {}
+class NoResultException extends ORMException
+{
+    public function __construct()
+    {
+        parent::__construct('No result was found for query although at least one row was expected.');
+    }
+}