auth: Crashfix to "doveadm auth cache flush" when auth cache was disabled
auth: Crashfix to "doveadm auth cache flush" when auth cache was disabled

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