NTML Auth required workstation number, but should not be required

[christopherpickering]

⚠️ Please verify that this bug has NOT been raised before.

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Description

Patch for #1639 in alpha.

If workstation is left blank a null value should not be passed to axios-ntlm.

👟 Reproduction steps

Pass a blank workstation number to ntlm auth

👀 Expected behavior

It is ok to have a blank workstation.

Also, workstation number should not be a password field.

😓 Actual Behavior

"Cannot read property 'length' of null".

🐻 Uptime-Kuma Version

1.17.0-Alpha

💻 Operating System and Arch

Ubuntu 20, MacOs

🌐 Browser

Safari

🐋 Docker Version

No response

🟩 NodeJS Version

Latest

📝 Relevant log output

No response