500 on report pages for unloggedin users

[dpoirier]

Small bug when a user who's not logged in tries to link directly to a report page, or when a user's login times out. (Moved from https://github.com/theirc/CTS/issues/430)

  File "/var/www/cts/source/reports/views.py", line 60, in dispatch
    if not self.user_may_access(request.user):
  File "/var/www/cts/source/reports/views.py", line 57, in user_may_access
    return user.is_superuser or user.role != ROLE_PARTNER or cls.partners_may_access
  File "/var/www/cts/env/local/lib/python2.7/site-packages/django/utils/functional.py", line 225, in inner
    return func(self._wrapped, *args)
AttributeError: 'AnonymousUser' object has no attribute 'role'