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

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.37%. Comparing base (06d591d) to head (d25a46d).
⚠️ Report is 346 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #1278    +/-   ##
========================================
  Coverage   93.37%   93.37%            
========================================
  Files        1110     1110            
  Lines       22244    22244            
  Branches     4715     4815   +100     
========================================
  Hits        20770    20770            
+ Misses       1409     1402     -7     
- Partials       65       72     +7     

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[DmytroAlipov]

@mphilbrick211 friendly ping

[mphilbrick211]

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

[mphilbrick211]

Hi @openedx/2u-tnl - would someone be able to please review this? Thanks!

[mphilbrick211]

Hi @openedx/2u-tnl - would someone be able to please review this? Thanks!

Flagging this, @openedx/2u-tnl

[mfarhan943]

@DmytroAlipov , this PR has conflicts. Kindly resolve them.

[DmytroAlipov]

@mfarhan943 done

[mfarhan943]

@DmytroAlipov It's breaking when save an empty correct answer, then edit and save the same values again.

[cmltaWt0]

Closed in favor of #2429