Allow config value to be an empty string and add option to unset it

[HypnoticYeti]

Checklist

• I confirm there are no unresolved issues reported on the Chocolatey Status page.
• I have verified this is the correct repository for opening this issue.
• I have verified no other issues exist related to my problem.
• I have verified this is not an issue for a specific package.
• I have verified this issue is not security related.
• I confirm I am using official, and not unofficial, or modified, Chocolatey products.

What You Are Seeing?

I'm trying to unset previously set values for the Chocolatey proxy and proxyBypassList settings, but I seem to be unable to do this using ChocolateyGUI. I can clear both settings, exit the settings screen, enter the settings screen again, and both settings have their original values. Modifying works, but clearing does not.
Only option to remove the values is by using the Chocolatey CLI 'config unset' command.

What is Expected?

When I remove the value for a specific setting, I would expect the configuration option to be 'unset'.

How Did You Get This To Happen?

Using CLI: choco config unset proxy
Using GUI:

1. enter settings screen, Chocolatey TAB
2. enter a value for the proxy setting (e.g. 'TEST')
3. exit the settings screen
4. enter settings screen, Chocolatey TAB
5. clear the value of the proxy setting (remove 'TEST')
6. exit the settings screen
7. enter settings screen, Chocolatey TAB
8. check the value of the proxy setting (it will be 'TEST')

System Details

• Operating System: 10.0.22631.0
• Windows PowerShell version: 5.1.22621.5909
• Chocolatey CLI Version: 2.5.1
• Chocolatey Licensed Extension version: n/a
• Chocolatey License type: n/a
• Terminal/Emulator: CMD, Windows PowerShell

Installed Packages

N/A

Output Log

ChocolateyGUI log displays a record when I modify a setting, e.g.:
2025-10-03 10:47:23.131 +02:00 [Warning] Updated proxy = TEST

However, when I clear its value, there is no record logged.

Additional Context

No response

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[pauby]

@gep13 can you validate this bug and confirm expected behaviour?

[gep13]

@pauby yes, I can confirm that Chocolatey GUI is responding exactly as described in the initial description.

The expected behaviour would be that if you leave the textbox for a specific value empty, that this empty string would be set within the chocolatey.config file. This isn't exactly the same as running the unset command, since that actually resets the configuration value back to the default value, which is not always an empty string.

I would suggest that there are actually two issues here. The first would be to ensure that attempting to save an empty string, results in the empty string making its way through to the chocolatey.config file, and the second would be to introduce another button within the UI to allow the unset command to be executed for the given configuration value.