fix: #187 return csv field value in widget

[Dresdn]

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Checklist

• I have double checked that there are no unrelated changes in this pull request (old patches, accidental config files, etc.)
• I have created at least one test case for the changes I have made
• I have updated the documentation for the changes I have made
• I have added my changes to the CHANGELOG.md

Pull Request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
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Related issue(s)

Closes #187

Other Information

[codecov]

Codecov Report

Merging #205 (361eebf) into master (04f5fa4) will increase coverage by 2.43%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #205      +/-   ##
==========================================
+ Coverage   87.36%   89.79%   +2.43%     
==========================================
  Files          20       20              
  Lines         736      745       +9     
  Branches      133      134       +1     
==========================================
+ Hits          643      669      +26     
+ Misses         71       52      -19     
- Partials       22       24       +2     

Impacted Files	Coverage Δ
eav/forms.py	79.16% <100.00%> (+24.23%)	⬆️
eav/widgets.py	64.00% <100.00%> (+16.94%)	⬆️

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