HPB check with invalid SSL certificate results in "Server responded with: 0"

[SystemKeeper]

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Steps to reproduce

1. Have a self-signed certificate for your signaling server
2. Run HPB test in admin settings with "Verify SSL certificate"

Expected behaviour

Correctly show that the SSL certificate is invalid

Actual behaviour

NC >= 28

NC <= 27

[SystemKeeper]

Guzzle exception for reference: