Fixed error message in server/details with respect to query params.

[rimashah25]

Closes: #6800

---

Which Traffic Control components are affected by this PR?

• Traffic Ops

What is the best way to verify this PR?

Curl /servers/details?hostname=foo and see error message

{
	"alerts": [{
		"text": "missing required fields: 'hostName' or 'physLocationID'",
		"level": "error"
	}]
}

If this is a bugfix, which Traffic Control versions contained the bug?

6.1.0

PR submission checklist

• This PR has tests
• This PR has documentation
• This PR has a CHANGELOG.md entry
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY (see the Apache Software Foundation's security guidelines for details)

[ericholguin]

LGTM

GET /server/details without any parameters:

{
    "alerts": [
        {
            "text": "missing required fields: 'hostName' or 'physLocationID'",
            "level": "error"
        }
    ]
}

[ocket8888]

I'm re-running the API tests