System error if trying to subscribe to a calendar while not logged in

[Guilherme Salgado]

If you go to http://localhost:8086/people/name16/+calendar/+subscribe without being logged in you'll get a traceback because there's no logged in user. I guess that page should be protected with launchpad.AnyPerson, because it makes no sense to allow anonymous subscriptions.

This is the relevant part of the traceback:
    ...
    * Module canonical.launchpad.browser.cal, line 763, in __init__
      self._subscriptions = ICalendarSubscriptionSubset(user)
    * Module zope.interface.interface, line 698, in __call__
      raise TypeError("Could not adapt", obj, self)

TypeError: ('Could not adapt', None, <InterfaceClass canonical.launchpad.interfaces.cal.ICalendarSubscriptionSubset>)

User: Anonymous