Don't run timeout timer when there's no ballot.

Change-Id: I281c9e163c13c24a6e75fb921c3b4c19c6eb8b50
Reviewed-on: http://review.couchbase.org/42946
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>