[Dovecot] imap process crashing with "file mail-cache-fields.c: line 26: unreached"

[Hans Morten Kind]

> --cut--
> Oct 27 11:20:11 hostname dovecot: IMAP(user): file mail-cache-fields.c:
> line 26: unreached
> Oct 27 11:20:11 hostname dovecot: child 27514 (imap) killed with signal
> 6
> --cut--


We did also experience this after moving to rc10,
by some reason field_has_fixed_size() in src/lib-index/mail-cache-fields.c
is called with an undef value of 32,
it seems to be safe to return FALSE rather than i_unreched()

hmk