Allow empty password in proxy auth

[jellor]

What type of PR is this? (check all applicable)

• [ ] Refactor
• [x] Feature
• [ ] Bug Fix
• [ ] Optimization
• [ ] Documentation Update
• [ ] Go Version Update
• [ ] Dependency Update

Description

Empty password should be allowed, when doing proxy authentication using basic auth.

Related Tickets & Documents

• Related Issue #
• Closes #

Added/updated tests?

• [x] Yes
• [ ] No, and this is why: please replace this line with details on why tests have not been included
• [ ] I need help with writing tests

Run verifications and test

• [ ] make verify is passing
• [ ] make test is passing