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 92.31%. Comparing base (fd48fef) to head (6401af3).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1278   +/-   ##
=======================================
  Coverage   92.31%   92.31%           
=======================================
  Files        1013     1013           
  Lines       18733    18733           
  Branches     3947     3950    +3     
=======================================
  Hits        17293    17293           
  Misses       1374     1374           
  Partials       66       66           

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