Fix checking when content is present in a non-bare repository accessed via http.

I thought at first this was a Windows specific problem, but it's not;
this affects checking any non-bare repository exported via http. Which is
a potentially important use case!

The actual bug was the case where Right False was returned by the first url
short-curcuited later checks. But the whole method used felt like code
I'd no longer write, and the use of undefined was particularly disgusting.
So I rewrote it.

Also added an action display.

This commit was sponsored by Eric Hanchrow. Thanks!

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