auth: Don't crash with "doveadm auth cache flush" when cache is disabled.
auth: Don't crash with "doveadm auth cache flush" when cache is disabled.

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot