Found in Sentry: a link such as /search/edits?conditions.0.args=&conditions.0.field=voter&conditions.0.name=aerozol&conditions.0.operator=%3D&conditions.0.voter_id=463559 causes an ISE when logged in - it seems to be caused by the empty conditions.0.args= leading to an empty WHERE () in the query. We should fail gracefully by either rejecting the link and showing an error, or dropping the WHERE if there's no conditions.