small test fix to properly display message

git-svn-id: http://svn.openlayers.org/trunk/openlayers@7600 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/Extras.html

@@ -11,7 +11,7 @@
     function test_Events_Object_Extension(t) {
         t.plan(1)
         map = new OpenLayers.Map("map");
-        t.ok("Map created if object prototype is extended.");
+        t.ok(true, "Map created if object prototype is extended.");
     }
   </script>
 </head>