set/unset batch permissions on groups raise an error

[mattiagiupponi]

Expected Behavior

When set/unset batch permissions on a group the flow should successfully finish

Actual Behavior

The BE raises the following log:

Fixup GIS Backend Security Rules Accordingly on resource geonode:san_andres_y_providencia_natural10 True
Internal Server Error: /groups/dataset/permission/
Traceback (most recent call last):
  File "/home/marthamareal/.virtualenvs/geonode/lib/python3.8/site-packages/celery/app/autoretry.py", line 34, in run
    return task._orig_run(*args, **kwargs)
  File "/opt/geonode/geonode/tasks/tasks.py", line 204, in set_permissions
    set_datasets_permissions(
  File "/opt/geonode/geonode/layers/utils.py", line 494, in set_datasets_permissions
    final_perms_payload["groups"] = {
  File "/opt/geonode/geonode/layers/utils.py", line 497, in <dictcomp>
    if _user not in copy_compact_perms.extended["groups"]
NameError: free variable '_user' referenced before assignment in enclosing scope

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/marthamareal/.virtualenvs/geonode/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/home/marthamareal/.virtualenvs/geonode/lib/python3.8/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/marthamareal/.virtualenvs/geonode/lib/python3.8/site-packages/django/views/generic/base.py", line 70, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/marthamareal/.virtualenvs/geonode/lib/python3.8/site-packages/django/views/generic/base.py", line 98, in dispatch
    return handler(request, *args, **kwargs)
  File "/opt/geonode/geonode/groups/views.py", line 61, in post
    return user_and_group_permission(request, 'groupprofile')
  File "/opt/geonode/geonode/base/views.py", line 134, in user_and_group_permission
    set_permissions.apply_async(
  File "/home/marthamareal/.virtualenvs/geonode/lib/python3.8/site-packages/celery/app/task.py", line 572, in apply_async
    return self.apply(args, kwargs, task_id=task_id or uuid(),
  File "/home/marthamareal/.virtualenvs/geonode/lib/python3.8/site-packages/celery/app/task.py", line 793, in apply
    ret = tracer(task_id, args, kwargs, request)
  File "/home/marthamareal/.virtualenvs/geonode/lib/python3.8/site-packages/celery/app/trace.py", line 464, in trace_task
    I, R, state, retval = on_error(
  File "/home/marthamareal/.virtualenvs/geonode/lib/python3.8/site-packages/celery/app/trace.py", line 451, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/home/marthamareal/.virtualenvs/geonode/lib/python3.8/site-packages/celery/app/autoretry.py", line 54, in run
    ret = task.retry(exc=exc, **retry_kwargs)
  File "/home/marthamareal/.virtualenvs/geonode/lib/python3.8/site-packages/celery/app/task.py", line 730, in retry
    raise ret
celery.exceptions.Retry: Retry in 3s: NameError("free variable '_user' referenced before assignment in enclosing scope")
"POST /groups/dataset/permission/ HTTP/1.1" 500 275904
Fixup GIS Backend Security Rules Accordingly on resource geonode:san_andres_y_providencia_natural10 True

Steps to Reproduce the Problem

1. go to the GroupProfile page
2. select batch permissions change
3. click save and check the logs

Specifications

• GeoNode version: master, 4.1.x
• Installation type (vanilla, geonode-project):
• Installation method (manual, docker):
• Platform:
• Additional details: