Table: Multisort tries to access invalid index

Describe the bug

When the multiSortMeta of the table is, for some reason, an empty array, the table tries to access an invalid index. This leads to unexpected behavior in our application.

TypeError: Cannot read properties of undefined (reading 'field')
    at i.multisortField (http://localhost:4200/chunk-5KJFCQPK.js:3048:17941)
    at http://localhost:4200/chunk-5KJFCQPK.js:3048:17680
    at Array.sort (<anonymous>)
    at i.sortMultiple (http://localhost:4200/chunk-5KJFCQPK.js:3048:17663)
    at i.onChanges (http://localhost:4200/chunk-5KJFCQPK.js:3048:13126)
    at i.ngOnChanges (http://localhost:4200/chunk-T7OEMV3O.js:156:9838)
    at i.lA (http://localhost:4200/chunk-T7OEMV3O.js:4:18716)
    at O_ (http://localhost:4200/chunk-T7OEMV3O.js:4:20279)
    at fA (http://localhost:4200/chunk-T7OEMV3O.js:4:20434)

Pull Request Link

https://github.com/primefaces/primeng/pull/19573

Reproducer

https://stackblitz.com/edit/github-kfctoa6w?file=src%2Fapp%2Fapp.component.html

Environment

PrimeNG: 20.4.0 Angular: 20 Browsers: Firefox, Chromium based browsers

Angular version

20.3.19

PrimeNG version

v20

Node version

24.13.0

Browser(s)

No response

Steps to reproduce the behavior

Filling the [multiSortMeta] of the Table Component with an empty array leads to the console error.

Expected behavior

The table component should be able to handle an empty array instead of throwing errors.