RFR: 8372757: MacOS, Accessibility: Crash in [MenuAccessibility accessibilityChildren] after JDK-8341311 [v2]

[Alexander Zuev]

> Perform null check before requesting information for the popup component and return nil if component is no longer exists.

Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:

  Adding exception check after calling java method from native.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28614/files
  - new: https://git.openjdk.org/jdk/pull/28614/files/017547d2..b1434f51

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28614&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28614&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28614.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28614/head:pull/28614

PR: https://git.openjdk.org/jdk/pull/28614