just FYI we only just now caught this because Ubuntu's recent USN-4230-1 pulled in these changes and was published 2020/01/08.
I've reported in https://bugs.launchpad.net/ubuntu/+source/clamav/+bug/1861497
- Bug#950296: clamav-daemon: dpkg-reconfigure clamav-daemon in... Cash Williams
- Bug#950296: noninteractive loop Cash
- Bug#950296: clamav-daemon.config Cash
- Bug#950296: patch works Cash
- Bug#950296: ubuntu Cash
