RFR: JDK-8323543: NPE when table items are set to null [v3]

[Andy Goryachev]

On Thu, 11 Jan 2024 16:48:53 GMT, Carl Döbbelin <duke at openjdk.org> wrote:

>> This PR fixes a nullpointer in TableSkinUtils that occured when the Tables items were null.
>
> Carl Döbbelin has updated the pull request incrementally with one additional commit since the last revision:
> 
>   JDK-8323543: add test and fix for another npe

Looks good, thank you for finding and fixing the issue!

This PR has a very narrow focus to be a candidate for a back port to jfx22 @kevinrushforth

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Marked as reviewed by angorya (Reviewer).

PR Review: https://git.openjdk.org/jfx/pull/1329#pullrequestreview-1816269167