RFR: 8242652: Throw SkippedException if no JS engine availabe in TestSearchScript [v2]

[Hannes Wallnöfer]

> This is a simple change to throw jtreg.SkippedException if no JavaScript engine is available to run the TestSearchScript test. In my previous attempt I tried to use the SkippedException class already present elsewhere in the test tree, not realizing I couuld just copy/create the exception in the javadoc test library.
> 
> Note that while the test is skipped correctly if no JS engine is available, the test will currently fail in the presence of a JS engine such as GraalJS. This is fixed by JDK-8244535.

Hannes Wallnöfer has updated the pull request incrementally with one additional commit since the last revision:

  Use existing SkippedException class in TestSearchScript.java

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1412/files
  - new: https://git.openjdk.java.net/jdk/pull/1412/files/d6bc3b79..02ab014b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1412&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1412&range=00-01

  Stats: 39 lines in 3 files changed: 5 ins; 34 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1412.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1412/head:pull/1412

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