Address dev friction with compare.html #2617
Merged
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Fixes compare.html not being generated for ysh-all on errors and makes it more informative so that it's clearer what caused the errors
Here's how osh-cpp's compare.html page looks like with this PR:

See https://op.oilshell.org/uuu/github-jobs/11017/cpp-spec.wwz/_tmp/spec/osh-cpp/compare.html for an example of "before", where it's unclear what the issue is.