Closes: #16837 - Fix type__empty filter in character-based filters #17574
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Fixes: #16837
Removes
choices
andnull_value
params from theextra
dict on a filterset field definition duringget_additional_lookups
, which allows the stock filter to be inited properly, meaning we no longer need to short-circuit the set of additional lookups to enable for filters such asMultipleChoiceFilter
and limit them only toFILTER_NEGATION_LOOKUP_MAP
if achoices
param is present.