Links never checked

Problem/Motivation

Some links, while detected and in the list to check, are never checked. Some of them are invalid domains. Some of them are working links.

Steps to reproduce

Make a basic page with links to http://nonexistentdomainasdf.com and http://eia.gov
Re-scan to add links to list
Run cron
See that links are still listed as "Never" checked

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes