[jfx17u] RFR: 8251481: TableCell accessing row: NPE on auto-sizing

[Jose Pereda]

Clean backport of 8251481: TableCell accessing row: NPE on auto-sizing
Reviewed-by: fastegal

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Commit messages:
 - 8251481: TableCell accessing row: NPE on auto-sizing

Changes: https://git.openjdk.org/jfx17u/pull/150/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=150&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8251481
  Stats: 50 lines in 3 files changed: 49 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx17u/pull/150.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u.git pull/150/head:pull/150

PR: https://git.openjdk.org/jfx17u/pull/150