Corrects a problem with unrestrictedTraverse. After conferring with Jim, the...

Corrects a problem with unrestrictedTraverse.  After conferring with Jim, the URL apparently isn't always needed.

lib/python/App/FactoryDispatcher.py

@@ -110,7 +110,10 @@ class FactoryDispatcher(Acquisition.Implicit):
         self._product=product
         self._d=dest
         if REQUEST is not None:
+            try:
                 v=REQUEST['URL']
+            except KeyError: pass
+            else:
                 v=v[:rfind(v,'/')]
                 self._u=v[:rfind(v,'/')]