Ensure Splinter and Sawtooth /batch_statuses endpoints return all possible data

[ameliabradley]

Splinter batch statuses endpoint needs to be able to accept an array of batch ids and correctly respond with all items. Currently it will return an error if one of the items is not known by the DLT, it will throw an error instead of returning all data for all batch ids.

Cargill/splinter#1815