Add check for formItem[key] before fetching formItem[key][subKey]

[standeren]

Description

fix cannot read properties of undefined reading 'addButton' on edit prop on RepeatingGroup when filtering properties on component that have expressions set

Related Issue(s)

• #{issue number}

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

[nkylstad]

[TomasEng]

Bra sett, @standeren, og bra at du la til en test for det!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.45%. Comparing base (390f7e6) to head (ca38c4f).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12435   +/-   ##
=======================================
  Coverage   87.45%   87.45%           
=======================================
  Files        1270     1270           
  Lines       18450    18450           
  Branches     2288     2288           
=======================================
  Hits        16136    16136           
  Misses       2040     2040           
  Partials      274      274           

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