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

[Andy Goryachev]

On Wed, 10 Jan 2024 18:53:02 GMT, Carl Döbbelin <duke at openjdk.org> wrote:

> This PR fixes a nullpointer in TableSkinUtils that occured when the Tables items were null.

FYI: there is also a possibility of an NPE in 

TableCellBehavior:70
TableView:2198
TableView:1922

I think we should add null checks there as well.

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

PR Comment: https://git.openjdk.org/jfx/pull/1329#issuecomment-1885471906