fix(configuration): port 0 treated as falsy in getvalidport validation

[lukebaze]

Description

The condition if (port) treats port 0 as falsy, causing it to bypass port validation and call getFreePort() instead. Port 0 is a valid network port (meaning 'any available port'), but this logic incorrectly treats it as 'no port specified'. Users explicitly configuring port 0 will get unexpected behavior.

Severity: medium
File: src/configuration/utils.ts

Expected Behavior

The code should handle this case properly to avoid unexpected errors or degraded quality.

[github-actions]

Thank you for submitting a bug report. We would love to help you investigate the issue. Please share a simple code example that reliably reproduces the bug. For more information, read the following article: How To Create a Minimal Working Example When You Submit an Issue. We look forward to your response.