fix: confirmation window is displayed after save for dropdown

[DmytroAlipov]

Description

"No answer specified" confirmation window is displayed all the time after the second save for dropdown.

Steps to Reproduce:

1. Add new Unit
2. Add new component Problem
3. Choose Dropdown
4. Fill in at least question and answers (for the correct answer, enter the number)
5. Click Save
6. Click on Edit for problem again
7. Click Save

[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 93.27%. Comparing base (fc94667) to head (e330941).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1278   +/-   ##
=======================================
  Coverage   93.27%   93.27%           
=======================================
  Files        1052     1052           
  Lines       20496    20496           
  Branches     4393     4379   -14     
=======================================
  Hits        19118    19118           
  Misses       1315     1315           
  Partials       63       63           

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

[DmytroAlipov]

@mphilbrick211 friendly ping

[mphilbrick211]

Hi @openedx/2u-tnl flagging this - thanks!