RFR: 8242652: Throw SkippedException if no JS engine availabe in TestSearchScript

[Hannes Wallnöfer]

On Thu, 26 Nov 2020 16:20:28 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

> ```
> external.lib.roots = ../../
> ```

Thanks @dfuch, that's exactly what was missing, adding that line makes `@library /test/lib` work. I'll update this PR to use the existing exception class.

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PR: https://git.openjdk.java.net/jdk/pull/1412