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When you filter on an attribute "is null" and that doesn't produce results, try "is equal to" "[space]" or "-". There are fields that aren't null because they have an invisible space.

Another way you can address all possibilities at once is in the filters:

"[Attribute]" "is equal to" "[space]"

OR "[Attribute]" "is null"

OR "[Attribute]" "is equal to" "-"