Backfill testing for handling link checking for non-existant links
Backfill testing for handling link checking for non-existant links

[#159437771](https://www.youtube.com/watch?v=gKQOXYB2cd8)

gu-bin/bosh-agent,mattcui/bosh-agent,mattcui/bosh-agent,cloudfoundry/bosh-agent,gu-bin/bosh-agent,gu-bin/bosh-agent,cloudfoundry/bosh-agent,mattcui/bosh-agent