imap: Don't crash if mailbox UIDVALIDITY is zero when SELECTing a mailbox.
imap: Don't crash if mailbox UIDVALIDITY is zero when SELECTing a mailbox.

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