This (and the 'title_or_id' sub-issue) are now fixed

I believe this is resolved with the patch to XUF's docLogin that I apply now.

It looks like XUF is returning 'Anonymous User' if the user is actually invalid
(which might be a bug in XUF or a problem in how it is being called).  Either
way, I propose to trap in workspaceSelectionForm the case where Anonymous User
is accessing it and dropping them back into a 'login failed' XUF form.

Site Error

An error was encountered while publishing this resource.

AttributeError
Sorry, a site error occurred.

Traceback (innermost last):

    * Module ZPublisher.Publish, line 188, in publish_module_standard
    * Module ZPublisher.Publish, line 145, in publish
    * Module Zope2.App.startup, line 222, in zpublisher_exception_hook
    * Module ZPublisher.Publish, line 114, in publish
    * Module ZPublisher.mapply, line 88, in mapply
    * Module ZPublisher.Publish, line 40, in call_object
    * Module Shared.DC.Scripts.Bindings, line 311, in __call__
    * Module Shared.DC.Scripts.Bindings, line 348, in _bindAndExec
    * Module App.special_dtml, line 175, in _exec
    * Module Products.SGDI.SGDI, line 948, in getNumWorkspaces
    * Module Products.SGDI.SGDI, line 955, in getWorkspaceNames
    * Module Products.SGDI.SGDI, line 989, in getWorkspaceDir
    * Module OFS.ObjectManager, line 273, in _getOb

AttributeError: Anonymous User (Also, the following error occurred while
attempting to render the standard error message, please see the event log for
full details: You are not allowed to access 'title_or_id' in this context)