Allow for wildcards or fail gracefully

So I got this error:
https://github.com/mgifford/o-hat-scanner/issues/13

I believe because of:
o-hat-scanner/runs/*

In the config here https://github.com/mgifford/o-hat-scanner/blob/main/.github/workflows/a11y-scan_gh.yml

Before I commented it out, I was hoping to be able to get back a wildcard of URLs:
https://mgifford.github.io/o-hat-scanner/runs/*

Instead it flagged `An accessibility scan flagged the element File not found `

That's a GitHub issue if it is one, not one tied to my project.

So this should fail more gracefully.

Start with .github/workflows/a11y-scan_gh.yml and the linked issue 13 to reproduce how the o-hat-scanner/runs/* URL is handled. Trace the scanner entry point that processes wildcard URLs and the reported “File not found” result. Done means the wildcard URL is handled gracefully without filing a project issue for the missing GitHub resource.

Written by the indexing model from the issue text.