Since the new QWeb engine, `groups` directives on template
rendered in a route with auth=none is simply ignored, since
all is done as SUPERUSER_ID, it was impossible to instanciate
the webclient to check if the session is valid and to display
meeting info or redirect to event form view.
It seems that we don't want to fix this because routes auth=none
are rare, and special. So it is not considered as a bug.
The fix for calendar is, however, to do redirection or template
rendering server side.
Jérome Maes
cfb8e8700a