lib-storage: Avoid crashes if listing subscriptions for a namespace that can't have any. i.e. the namespace and its parents all have subscriptions=no
lib-storage: Avoid crashes if listing subscriptions for a namespace that can't have any.
i.e. the namespace and its parents all have subscriptions=no

jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,jkerihuel/dovecot,jkerihuel/dovecot,jwm/dovecot-notmuch