fts-lucene: Don't crash if expunging didn't actually do anything.
fts-lucene: Don't crash if expunging didn't actually do anything.

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