Uploading images not working

[timobrembeck]

Describe the Bug

When somebody tries to upload an image, a server error occurs.

Steps to Reproduce

1. Go to public upload
2. Upload image
3. See error

Expected Behavior

The image should be uploaded

Actual Behavior

The error appears:

Jun 27 09:08:26 ERROR   django.request - Internal Server Error: /public_upload
Traceback (most recent call last):
  File "/opt/lunes-cms/.venv/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/opt/lunes-cms/.venv/lib/python3.9/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/opt/lunes-cms/.venv/lib/python3.9/site-packages/lunes_cms/cms/views/other_viewset.py", line 36, in public_upload
    image = DocumentImage(
  File "/opt/lunes-cms/.venv/lib/python3.9/site-packages/django/db/models/base.py", line 503, in __init__
    raise TypeError("%s() got an unexpected keyword argument '%s'" % (cls.__name__, kwarg))
TypeError: DocumentImage() got an unexpected keyword argument 'name'

Additional Information

This is a remnant of #340