[Geary] è:nonletto is not working

[Federico Bruni <fede inventati org>]

Hello

I'm having a problem with a search operator in the italian localized 
interface, that is:

è:nonletto

(italian version of is:unread)

In english it works fine, while the italian version causes a segfault:

[deb] 10:39:06 1,279779 imap-db-account.vala:837: Search processing: 
term -> stem is "nonletto" -> "nonlett"
**
ERROR:/home/fede/src/geary/src/engine/imap-db/imap-db-account.vala:1180:geary_imap_db_account_search_async_co: 
assertion failed: (search_results != null && search_results.size > 0)
Annullato (core dump creato)

It's strange: it worked fine when I made the translation and tested it.
Any idea about what might be wrong? Should I use gdb or the above 
output is enough?

Thanks
Federico