lib-storage: Fixed crash with some autocreated (e.g. shared) namespaces.
lib-storage: Fixed crash with some autocreated (e.g. shared) namespaces.

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