If we couldn't lock dovecot-uidlist, drop our appends so they don't get written to transaction log with uid=0.
If we couldn't lock dovecot-uidlist, drop our appends so they don't get
written to transaction log with uid=0.

--HG--
branch : HEAD

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