1. Log in as admin
2. Go to https://archiveofourown.org/admin/invitations
3. In the "Enter all or part of an email address" field under Track Invitations, enter a nonexistent email.
What happens: nothing. If there's no result found, the page just stares at you blankly.
What should happen: it generates a message saying "No results were found. Try another search." if no matches are found.