[jdk17u-dev] RFR: 8322239: [macos] a11y : java.lang.NullPointerException is thrown when focus is moved on the JTabbedPane

[Goetz Lindenmaier]

I backport this for parity with 17.0.12-oracle.

-------------

Commit messages:
 - Backport 3b1062d45df69d4cf8479c6a65602bd2453ab885

Changes: https://git.openjdk.org/jdk17u-dev/pull/2292/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2292&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322239
  Stats: 115 lines in 2 files changed: 111 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2292.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2292/head:pull/2292

PR: https://git.openjdk.org/jdk17u-dev/pull/2292