[jdk21u-dev] RFR: 8330702: Update failure handler to don't generate Error message if cores actions are empty

[Goetz Lindenmaier]

I backport this for parity with 21.0.5-oracle

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Commit messages:
 - Backport 548e95a689d63e97ddbdfe7dd7df3a2e3377046c

Changes: https://git.openjdk.org/jdk21u-dev/pull/1384/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1384&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330702
  Stats: 9 lines in 2 files changed: 5 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1384.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1384/head:pull/1384

PR: https://git.openjdk.org/jdk21u-dev/pull/1384