Do not include empty output in job run output

[andrewnester]

Changes

Do not include empty output in job run output

Tests

Running a job from CLI, the result:

andrew.nester@HFW9Y94129 wheel % databricks bundle run some_other_job --output json
Run URL: https://***/?o=6051921418418893#job/780620378804085/run/386695528477456

2023-09-08 11:33:24 "[default] My Wheel Job" TERMINATED SUCCESS 
{
  "task_outputs": [
    {
      "TaskKey": "TestTask",
      "Output": {
        "result": "Hello from my func\nGot arguments v2:\n['python']\n"
      },
      "EndTime": 1694165597474
    }
  ]

[pietern]

Could you take a look at the JSON structure of this output as well?

With task keys being unique, I think we can emit a JSON object like:

{
  "run_id": 123,
  "tasks": {
    "TaskKey": {
      "run_id": 456,
      "end_time": 123,
      "output": {
        //...
      },
    },
  },
}

@shreyas-goenka I suspect the origin of emitting an array has to do with how this is presented in text output mode, correct? There it is ordered by the end time of a task such that the output is sequential w.r.t. the execution time.