[jfx17u] RFR: 8187145: (Tree)TableView with null selectionModel: throws NPE on sorting

[Johan Vos]

Almost clean (apart from some offsets) backport of

8187145: (Tree)TableView with null selectionModel: throws NPE on sorting

Reviewed-by: aghaisas, kcr

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Commit messages:
 - 8187145: (Tree)TableView with null selectionModel: throws NPE on sorting

Changes: https://git.openjdk.org/jfx17u/pull/123/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=123&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8187145
  Stats: 469 lines in 15 files changed: 378 ins; 12 del; 79 mod
  Patch: https://git.openjdk.org/jfx17u/pull/123.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u pull/123/head:pull/123

PR: https://git.openjdk.org/jfx17u/pull/123