fix for insufficient mocking which resulted in an error being thrown on

teardown by IE; add a .destroy() to the mocked renderer. 


git-svn-id: http://svn.openlayers.org/trunk/openlayers@9251 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/Layer/Vector.html

@@ -269,7 +269,8 @@
                     feature: f,
                     style: s
                 };
-            }
+            },
+            destroy: function() {}
         };
         
         // draw feature with no state