A valid user session is required for circles.
A valid user session is required for circles.

The circles app depends on a valid userId. A public shared calender might be viewed by guests without a user session. For such requests the principal is null.

Signed-off-by: Daniel Kesselberg <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@danielkesselberg.de>

nextcloud/server,nextcloud/server,nextcloud/server,nextcloud/server