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]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
2541	1	2540	23

View the top 1 failed test(s) by shortest run time

tests/onegov/town6/test_views_directory.py::test_directory_change_request_with_multiple_uploads

Stack Traces | 4.01s run time

client = <tests.onegov.town6.conftest.Client object at 0x7f7db1cea210>

    def test_directory_change_request_with_multiple_uploads(client):
        client.login_admin()
    
        # Create a directory with multiple file upload field
        page = client.get('/directories').click('Verzeichnis')
        page.form['title'] = "Contacts"
        page.form['structure'] = """
            E-Mail *= @@@
            Telefon *= ___
            Downloads = *.pdf (multiple)
        """
        page.form['title_format'] = '[E-Mail]'
        page.form['enable_change_requests'] = True
        page.form['content_fields'] = 'E-Mail\nTelefon\nDownloads'
        page = page.form.submit().follow()
    
        # Create an initial entry
        page = page.click('Eintrag', index=0)
        page.form['e_mail'] = '[email protected]'
        page.form['telefon'] = '123456'
        path = module_path('tests.onegov.town6', 'fixtures/sample.pdf')
        with open(path, 'rb') as f:
            page.form['downloads'] = [
                Upload('Sample.pdf', f.read(), 'application/pdf')
            ]
    
        entry_page = page.form.submit().follow()
        entry_url = entry_page.request.url
    
        # Spawn anonymous user to suggest a change
        anon_client = client.spawn()
        page = anon_client.get(entry_url)
        change_page = page.click('Änderung für diesen Eintrag vorschlagen')
    
        # Fill change request form
        change_page.form['submitter'] = '[email protected]'
        # Submit to preview - this triggers render_original for diff
        try:
            preview_page = change_page.form.submit().follow()
        except AttributeError as e:
            # property 'data' of 'UploadMultipleField' object has no setter
            fail('Got AttributeError!')
    
>       assert 'Vorschau' in preview_page
E       AssertionError: assert 'Vorschau' in <200 OK text/html body=b'<!DOCTYP...\n\n'/35639>

.../onegov/town6/test_views_directory.py:264: AssertionError

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