Fix initialization of calendar search URIs
Fix initialization of calendar search URIs

They are an empty array by default. If you don't initialize then
accessing them via the setter will throw a type error.

Signed-off-by: Christoph Wurst <7abde52c298496fa169fb750f91f213a282142af@winzerhof-wurst.at>

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