"Tests Broken on IE6". This adds an additional check that prevents IE6 from complaining about undefined properties. r=crschmidt (closes #1322)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@6021 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Events.js

@@ -313,7 +313,10 @@ OpenLayers.Event = {
      *   stopObservingElement on each. 
      */
     unloadCache: function() {
-        if (OpenLayers.Event.observers) {
+        // check for OpenLayers.Event before checking for observers, because
+        // OpenLayers.Event may be undefined in IE if no map instance was
+        // created
+        if (OpenLayers.Event && OpenLayers.Event.observers) {
             for (var cacheID in OpenLayers.Event.observers) {
                 var elementObservers = OpenLayers.Event.observers[cacheID];
                 OpenLayers.Event._removeElementObservers.apply(this,