Directory: Fixes UploadMultipleField not working in request changes

[cyrillkuettel]

Commit message

TYPE: Bugfix
LINK: OGC-2234

Checklist

• I considered adding a reviewer
• I have tested my code thoroughly by hand
• I have added tests for my changes/features

[linear]

OGC-2234 Formular `AttributeError` bei `UploadMultipleField` (Horw)

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.80%. Comparing base (c78c371) to head (e8c214b).
⚠️ Report is 526 commits behind head on master.

Files with missing lines	Patch %	Lines
src/onegov/org/forms/extensions.py	90.90%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/onegov/org/forms/extensions.py	90.71% <90.90%> (+0.93%)	⬆️

... and 5 files with indirect coverage changes

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