Adding a bit of flexibility to extend and applyDefaults. First argument can now be undefined. r=pspencer,elemoine (closes #1564)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@7311 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Util.js

@@ -49,7 +49,8 @@ if ($ == null) {
  * {Object} The destination object.
  */
 OpenLayers.Util.extend = function(destination, source) {
-    if(destination && source) {
+    destination = destination || {};
+    if(source) {
         for(var property in source) {
             var value = source[property];
             if(value !== undefined) {
@@ -522,7 +523,7 @@ OpenLayers.Util.upperCaseObject = function (object) {
  *     in place and returned by this function.
  */
 OpenLayers.Util.applyDefaults = function (to, from) {
-
+    to = to || {};
     /*
      * FF/Windows < 2.0.0.13 reports "Illegal operation on WrappedNative
      * prototype object" when calling hawOwnProperty if the source object is an