fix tests -- ie destroys page and thereofre map object, which causes problems with this simulated renderer (it needs a destroy)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@3111 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/Layer/test_Vector.html

@@ -119,7 +119,8 @@
         layer.renderer = {
             eraseFeatures: function(features) {
                 f = features[0];
-            }
+            },
+            destroy: function() { }
         };
 
         layer.eraseFeatures([feature]);