ycb_django_pr11163

what a new run launched now would send

model_to_dict() should return an empty dict for an empty list of fields.
Description
	
Been called as model_to_dict(instance, fields=[]) function should return empty dict, because no fields were requested. But it returns all fields
The problem point is
if fields and f.name not in fields:
which should be
if fields is not None and f.name not in fields:
PR: ​https://github.com/django/django/pull/11150/files

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