lib-storage: Don't try to create /dovecot.mailbox.index when indexes are disabled.
lib-storage: Don't try to create /dovecot.mailbox.index when indexes are disabled.

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