[jdk21u-dev] RFR: 8332431: NullPointerException in JTable of SwingSet2

[Matthias Baesken]

Backport of 8332431

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Commit messages:
 - Backport 9a83dfee14f4cd9cda476d11a027294a810953cb

Changes: https://git.openjdk.org/jdk21u-dev/pull/630/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=630&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332431
  Stats: 15 lines in 1 file changed: 10 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/630.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/630/head:pull/630

PR: https://git.openjdk.org/jdk21u-dev/pull/630