Handle non kv-list error_logger reports.

Change-Id: I3cdf094eba418f7a4408b4cb8ce61e3c03bee768
Reviewed-on: http://review.couchbase.org/30874
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>