SelectButton in v16.7.1 is only partially fixed

[rosenthalj]

Describe the bug

Issue #14021 (SelectButton broken in v16.7.0) for v16.7.1 was only partially fixed.

In v16.7.1 the option value is now correctly updated, but the property allowEmpty is still ignored.

I have updated the original reproducer to use PrimeNG v1.16.7.1 (no other changes) to demonstrate this issue.

The video listed below shows that the allowEmpty property is ignored (it also shows that the optitionValue is being set correctly)

SelectButtonAllowEmpty.mov

Environment

mac os and windows

Reproducer

https://stackblitz.com/edit/uqd2gx-4ug53g

Angular version

16.x

PrimeNG version

16.7.1

Build / Runtime

Angular CLI App

Language

TypeScript

Node version (for AoT issues node --version)

18.18.1

Browser(s)

safari, chrome, firefox

Steps to reproduce the behavior

1. Run the reproducer: https://stackblitz.com/edit/uqd2gx-4ug53g
2. Click the "Off" button on the top SelectButton
3. The "Off" button color will change from blue to white and "select button: value = false" label will change to "select button: value = null"

Expected behavior

No change. The "Off" button color should remain blue and "select button: value = false" should also not change