[jdk21u-dev] RFR: 8294155: Exception thrown before awaitAndCheck hangs PassFailJFrame

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle,

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Commit messages:
 - Backport 906358d3a14ce755fec771f0a6bb856b3a8f3297

Changes: https://git.openjdk.org/jdk21u-dev/pull/1522/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1522&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294155
  Stats: 14 lines in 1 file changed: 12 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1522.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1522/head:pull/1522

PR: https://git.openjdk.org/jdk21u-dev/pull/1522