TypeError: argument of type 'NoneType' is not iterable

[sentryk8sonalabsorg]

TypeError: argument of type 'NoneType' is not iterable
(9 additional frame(s) were not displayed)
...
  File "onadata/libs/filters.py", line 746, in filter_queryset
    all_qs = self._xform_filter_queryset(
  File "onadata/libs/filters.py", line 406, in _xform_filter_queryset
    kwarg = self._xform_filter(request, view, keyword, queryset)
  File "onadata/libs/filters.py", line 338, in _xform_filter
    if xform is None and "xform" in request.data:

[ukanga]

Seems to be a duplicate of #2601 closed by #2600.