fix: Datatable multisortField - Fix undefined values sorting

[MalikBen]

Fixes #4555

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Name	Status	Preview	Comments	Updated (UTC)
primevue	⬜️ Ignored (Inspect)	Visit Preview		Oct 5, 2023 9:27am

[mertsincan]

Thanks a lot for your contribution! @melloware Have you done any work on this in PrimeReact? If I remember correctly, you added something.

[melloware]

@mertsincan yes this all works in Primereact and I broke it out into a re-usable static utility in PrimeReact so we can use it every where we sorted and it handles locales and whether you want to sort like Excel with NULLS at top or bottom.

https://github.com/primefaces/primereact/blob/75e535833ab33f971ac66c7712134914415525c5/components/lib/utils/ObjectUtils.js#L377-L401

[melloware]

@FlipWarthog you know the PrimeVue base a little better than I do but maybe we can port the PrimeReact sorting stuff here to Primevue?

[FlipWarthog]

@melloware Sure, lemme digest what you did on the React side and see how it would fit here

[mertsincan]

@MalikBen Thanks a lot for your contribution! I think a fix like in PrimeReact might be better. So, closed.

Thanks again,
Best Regards,