Fix stream read given stream doesn't have any slice

[maxi297]

What

Resolving message grouper error where there is not request performed for the stream (outside of auxiliary requests)

How

Remove the validation as it shows that the assumption that we would always have a request is false.

🚨 User Impact 🚨

Once merged in the Connector Builder project, it will stop failing if the substream partition router does not a return a slice

[girarda]

what's the error message we want to show here? something along the lines of "No requests were submitted. Check the configuration of the partition routers"?

[maxi297]

Currently, this is not considered to be an error by the CDK as it will only ignore this loop. Should this be an error in the Connector Builder?

[maxi297]

I've asked the frontend team if they could show a warning when we have slices == []. If this is good, I'll merge with the fix where we return

{
    "type": "RECORD",
    "record": {
        "stream": "List Events",
        "data": {
            "logs": [],
            "slices": [],
            "test_read_limit_reached": false,
            "auxiliary_requests": [...],
            "inferred_schema": null,
            "inferred_datetime_formats": {},
            "latest_config_update": null
        },
        "emitted_at": 1690399116000
    }
}

instead of

{
    "type": "RECORD",
    "record": {
        "stream": "List Events",
        "data": {
            "logs": [],
            "slices": [
                {
                    "pages": [
                        {
                            "records": [],
                            "request": null,
                            "response": null
                        }
                    ],
                    "slice_descriptor": null,
                    "state": null
                }
            ],
            "test_read_limit_reached": false,
            "auxiliary_requests": [...],
            "inferred_schema": null,
            "inferred_datetime_formats": {},
            "latest_config_update": null
        },
        "emitted_at": 1690399116000
    }
}