MultiSelect: error when selecting option with null value

[VsevolodGolovanov]

I'm submitting a ... (check one with "x")

[x] bug report
[ ] feature request
[ ] support request => Please do not submit support request here, instead see https://forum.primefaces.org/viewforum.php?f=57

Codesandbox Case (Bug Reports)
https://codesandbox.io/s/romantic-poincare-s7lik

Current behavior
Selecting an option with null value results in error.

Expected behavior
Selecting an option with null value should work fine (it even already works with undefined).

Minimal reproduction of the problem with instructions
Open codesandbox, select "Null" in the MultiSelect.

Please tell us about your environment:

• React version:

• PrimeReact version:
  4.2.2

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

• Language: [all | TypeScript X.X | ES6/7 | ES5]

[VsevolodGolovanov]

Actually it doesn't work right with undefined as well. onChange e.value supplies the option object itself instead of option.value (=== undefined). Maybe that's fine, but null should probably be supported.