fix(stream): change XREADGROUP response for empty read response

[jonathanc-n]

references #2568

Changed XReadGroup response for empty responses to match redis behaviour.

[torwig]

@jonathanc-n Should we change existing tests or add extra tests for this case if they don't exist?

[jonathanc-n]

@torwig changes in this particular pr are negligible so probably doesn't need a test, but for the other half of the issue I believe there should be a test.

[torwig]

@jonathanc-n How to be sure that bug was fixed? Exactly, write a test :)

There is a classic flow for fixing a bug:

1. Write a test that fails.
2. Fix a bug.
3. Assert that the test passes -> it will prevent any regression.

[jonathanc-n]

I see, thank you for letting me know! :)

[jonathanc-n]

@torwig The test is added

[jonathanc-n]

@torwig I made some changes to the stream, hopefully it passes all the checks now

[jonathanc-n]

@PragmaTwice Do you know why this might be failing? I am not too sure myself

[PragmaTwice]

It keeps failing even after multiple retries.

I'll look into it soon.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
61.4% Coverage on New Code
2.0% Duplication on New Code

See analysis details on SonarCloud