Username and password required for Socks5 proxy without auth

I rebuild the code after the fix from the pull request #167 regarding the issue #166 and managed to perform a basic scraping task.
When I tried adding a local Socks5 proxy without any authentication configured, the job failed to start with the following error message :

2025/08/27 14:17:54 error scraping job 33589605-1cd9-4f69-9809-a8cdfdecadd3: failed to start auth proxy for socks5://127.0.0.1:9050: username and password are required

The proxy I used is tor from the windows expert bundle that I launched using the CLI and the address I gave to the scraper is socks5://127.0.0.1:9050 .

Reproduce the failure with the Windows Tor expert bundle at socks5://127.0.0.1:9050, then trace the scraper's proxy setup and authentication path. The fix is done when a SOCKS5 proxy without credentials starts successfully while authenticated proxy behavior remains intact.

Written by the indexing model from the issue text.