Allow me to send over here the response sent privately for reference purposes:
I believe the easiest way would be to apply a filter directly to the insight for the attribute Judicial Review Application so the insight displays the values that do not have one, typically as a NULL value or " ". Note that if the null values are not in the workspace, then it won't be possible for the platform to interpret them as NULL.
Additionally, you can create an SQL dataset where you can apply the query directly. It's the same idea as here:
https://gooddataconnect.slack.com/archives/C01P7PBJFLH/p1733955517954199?thread_ts=1733954466.257939&cid=C01P7PBJFLH