RFR: 8296413: Tree/TableView with null focus model throws NPE in queryAccessibleAttribute() [v2]

[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 with a new target base due to a merge or a rebase. The pull request now contains 29 commits:

 - 8296413: 2023
 - Merge remote-tracking branch 'origin/master' into 8296413.query.accessible
 - Merge remote-tracking branch 'origin/master' into
   8296413.query.accessible
 - Merge branch '8187145.null.selection.model' into 8296413.query.accessible
 - Merge remote-tracking branch 'origin/master' into 8187145.null.selection.model
 - Merge branch '8187145.null.selection.model' into 8296413.query.accessible
 - Merge remote-tracking branch 'origin/master' into 8187145.null.selection.model
 - 8296413: cleanup
 - Merge branch '8187145.null.selection.model' into 8296413.query.accessible
 - Merge remote-tracking branch 'origin/master' into 8187145.null.selection.model
 - ... and 19 more: https://git.openjdk.org/jfx/compare/a35c3bf7...6111660b

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

Changes: https://git.openjdk.org/jfx/pull/938/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=938&range=01
  Stats: 235 lines in 8 files changed: 181 ins; 26 del; 28 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