[PATCH] test: silence the output of notmuch new mid-test

[David Bremner]

Jani Nikula <jani at nikula.org> writes:

> Fix this during test run:
>
> T470-missing-headers: Testing messages with missing headers
> Added 2 new messages to the database.

Pushed. I'm gonna miss that message though, as a kind of progress
indicator ;).

d