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[EP-tech] How to allow users to search for NULL values?

Hi,
(How) can I let the users search for eprints that have NULL in a particular field?
For example, I see there are options "No Preference", "Yes" and "No" available for a boolean field, but I'd like people to be able to find eprints with "No Value" - to make data quality control easier. Same would make sense for other field types, too - is there some standard option somewhere? 

Regards,
Jan Ploski