Fix for string form fields

[SchrodingersGat]

• replace null values with empty strings
• Ensure that strings are not replaced with null values sometimes

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[wolflu05]

We have to carefully consider this change, I'm not really sure if this does not break something.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 87.98%. Comparing base (3a18934) to head (33f0c7d). :warning: Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10814      +/-   ##
==========================================
- Coverage   88.17%   87.98%   -0.19%     
==========================================
  Files        1289     1290       +1     
  Lines       58051    58101      +50     
  Branches     1973     1973              
==========================================
- Hits        51184    51123      -61     
- Misses       6376     6487     +111     
  Partials      491      491              

Flag	Coverage Δ
backend	89.47% <100.00%> (+<0.01%)	:arrow_up:

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Components	Coverage Δ
Backend Apps	91.77% <ø> (-0.26%)	:arrow_down:
Backend General	93.12% <ø> (-0.36%)	:arrow_down:
Frontend	70.87% <ø> (-0.01%)	:arrow_down:

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[SchrodingersGat]

@wolflu05 I have added some extra checks here, it will only overwrite a null value if the serializer does not allow null values

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💚 All backports created successfully

Status	Branch	Result
✅	1.1.x

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