Closes: #17575 - Add NullableMultipleChoiceFilter and filter form UI to match empty string #17576
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Closes: #17575
Adds a
NullableMultipleChoiceFilter
class (patterned on the existingNullableCharFieldFilter
) which can be used in a multiple-choice FilterForm input to add the "(unset)" (''
) value to a list of acceptable choices in the filter, evaluated in an OR fashion in a single query.