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/Layer/WFS.js

@@ -138,11 +138,10 @@ OpenLayers.Layer.WFS = OpenLayers.Class(
             this.options.geometry_column = "the_geom";
         }    
         
-        this.params = params;
-        OpenLayers.Util.applyDefaults(
-                       this.params, 
-                       OpenLayers.Util.upperCaseObject(this.DEFAULT_PARAMS)
-                       );
+        this.params = OpenLayers.Util.applyDefaults(
+            params, 
+            OpenLayers.Util.upperCaseObject(this.DEFAULT_PARAMS)
+        );
         this.url = url;
     },