RFR: 8296413: Tree/TableView with null focus model throws NPE in queryAccessibleAttribute() [v3]

[Andy Goryachev]

> - added test to ensure no exception is thrown from Control.queryAccessibleAttribute() for all accessible attributes values
> - fixed null focus model case in Tree/TableView

Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:

  8296413: 2023

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Changes:
  - all: https://git.openjdk.org/jfx/pull/938/files
  - new: https://git.openjdk.org/jfx/pull/938/files/6111660b..f7ecf537

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=938&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=938&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/938.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/938/head:pull/938

PR: https://git.openjdk.org/jfx/pull/938