Message about value cannot be null appears when using a locally defined source

### Checklist

- [x] I confirm there are no unresolved issues reported on the [Chocolatey Status page](https://status.chocolatey.org).
- [x] I have verified this is the correct repository for opening this issue.
- [x] I have verified no other issues exist related to my problem.
- [x] I have verified this is not an issue for a specific package.
- [x] I have verified this issue is not security related.
- [x] I confirm I am using **official**, and **not** unofficial, or modified, Chocolatey products.

### What You Are Seeing?

When running `choco outdated --trace` I get:
```
Chocolatey v2.5.0
Operating System Version Number: 10.0.26100.0
Outdated Packages
Output is Id | Version | Available Version | Pinned

Attempted to use a source name https://FQDN/repository/nuget-group/ to get default source but failed:
Value cannot be null.
Parameter name: s
```

### What is Expected?

No failure messages

### How Did You Get This To Happen?

We have the following source defined that points to a local Sonatype Nexus3 repository:
```
choco source add --name "'NWRA'" --source="'https://FQDN/repository/nuget-group/'" --priority="'10'" --cert "'C:\ssl\private\client.pfx'" --bypassProxy
```
`choco source list` shows:
```
chocolatey - https://community.chocolatey.org/api/v2/ | Priority 0|Bypass Proxy - False|Self-Service - False|Admin Only - False.
NWRA - https://FQDN/repository/nuget-group/ (Authenticated)| Priority 10|Bypass Proxy - True|Self-Service - False|Admin Only - False.
```

### System Details

* Operating System: 10.0.26100.0
* Windows PowerShell version:
```
Name Value
---- -----
PSVersion 5.1.26100.4652
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.26100.4652
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
```
* Chocolatey CLI Version: 2.5.0
* Chocolatey Licensed Extension version: Chocolatey v2.5.0
0 packages installed.
* Chocolatey License type: Community
* Terminal/Emulator: PowerShell

### Installed Packages

```bash
Chocolatey v2.5.0
7zip.install 25.0.0
adobereader 2025.1.20577
airtame 4.12.0
choco-cleaner 1.1.1
chocolatey 2.5.0
chocolatey-compatibility.extension 1.0.0
chocolatey-core.extension 1.4.0
chocolatey-dotnetfx.extension 1.0.1
chocolatey-windowsupdate.extension 1.0.5
cmake.install 4.0.3
DotNet4.5 4.5.20120822
Firefox 141.0.0
git.install 2.50.1
GoogleChrome 138.0.7204.169
KB2919355 1.0.20160915
KB2919442 1.0.20160915
KB2999226 1.0.20181019
KB3033929 1.0.5
KB3035131 1.0.3
KB3118401 1.0.5
keepass.install 2.59.0
microsoft-teams.install 1.8.0.18356
miniconda3 4.12.0
netfx-4.8 4.8.0.20220524
nxlog 3.2.2329
openssl 3.5.1
powershell-core 7.5.2
putty-cac 0.83.0.1
slack 4.45.64
thunderbird 139.0.2
ungoogled-chromium 137.0.7151.681
vcredist140 14.44.35211
vcredist2015 14.0.24215.20170201
Wget 1.21.4
winlogbeat-oss 7.12.1
wireshark 4.4.8
yubico-authenticator 7.2.3
yubikey-manager 1.2.6
zoom 6.5.7.9933
39 packages installed.
```

### Output Log

```bash
2025-07-24 11:42:34,307 8252 [DEBUG] - Process Tree: Chocolatey CLI => Chocolatey CLI => pwsh => explorer
2025-07-24 11:42:34,318 8252 [DEBUG] - Updating User Agent to 'Chocolatey Command Line/2.5.0 (Chocolatey CLI) via NuGet Client/6.4.1 (Microsoft Windows NT 10.0.26100.0)'.
2025-07-24 11:42:34,324 8252 [DEBUG] - Using proxy server 'http://PROXY:8080'.
2025-07-24 11:42:34,329 8252 [DEBUG] - Proxy has a bypass list of 'localhost,127.0.0.0/8,::1,10.0.0.0/8,192.168.0.0/16,.nwra.com'.
2025-07-24 11:42:34,355 8252 [DEBUG] - Source 'https://FQDN/repository/nuget-group/' is configured to bypass proxies.
2025-07-24 11:42:34,363 8252 [DEBUG] - Using configured certificate for source https://nwchoco.nwra.com/repository/nuget-group/
2025-07-24 11:42:34,369 8252 [WARN ] - Attempted to use a source name https://FQDN/repository/nuget-group/ to get default source but failed:
Value cannot be null.
Parameter name: s
```

### Additional Context

This still seem to work, but this error message makes it seem like it isn't.