ARS has no merged version or `knowledge_graph` or `results` when no ARAs return results

[maximusunc]

Though maybe very rare and technically not invalid TRAPI, could the ARS still produce a merged version response that has all assumed fields in the message?

Here's an example where the ARAs all returned no results: https://ars-dev.transltr.io/ars/api/messages/9d26d3d4-8719-46e6-92d3-8f45799ad854?trace=y

[ShervinAbd92]

Hi @maximusunc sure we can do that. now the knowledge_graph, results and aux_graph are all going to be empty but do u want the query graph to be included in this merged_message?

[maximusunc]

Yeah, I think the original query graph, plus empty knowledge_graph with empty nodes and edges, an empty results list, and empty auxiliary_graphs

[ShervinAbd92]

Got you, let me get that added.