fix: request error for empty user list responses

[DmytroAlipov]

This is backport from the master.

Description:

"An unexpected error occurred" if you try to get all responses when the users' list is empty:

1. Open ORA Grading:

2. In Search username fill in not existing student username:

3. Click on View all responses:

I suggest not sending a request if the users are not on the list.

[openedx-webhooks]

Thanks for the pull request, @DmytroAlipov!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (c644da3) to head (a643cae).

❗ Current head a643cae differs from pull request most recent head 8e3f8dd. Consider uploading reports for the commit 8e3f8dd to get more accurate results

Additional details and impacted files

@@                     Coverage Diff                      @@
##           open-release/quince.master      #290   +/-   ##
============================================================
  Coverage                      100.00%   100.00%           
============================================================
  Files                             110       110           
  Lines                            1079      1080    +1     
  Branches                          159       160    +1     
============================================================
+ Hits                             1079      1080    +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mphilbrick211]

Hi @openedx/content-aurora! This is ready once the master is all set.

[arbrandes]

Marking as draft until the fix is merged to master.

[DmytroAlipov]

Hi, @arbrandes
Could you merge this PR so that this fix would be included in Quince 3.
Thank you

[mphilbrick211]

Hi @jansenk! Are you able to merge this for us?

[mariajgrimaldi]

Hello @jansenk, could you help us merge this PR? I don't have write permissions for this repo, so I can't.