V-73611: Current test code error prone

[rx294]

V-73611: Current test code error prone because it relized on comparison to a null string...

suggested test code

 Get-ChildItem -Path Cert:\LocalMachine\ | ConvertTo-Json
.
.
.
    {
        "StoreHandle":  null,
        "Location":  2,
        "Name":  "My",
        "Certificates":  [

                         ],
        "PSPath":  "Microsoft.PowerShell.Security\\Certificate::My",
        "PSParentPath":  "",
        "PSChildName":  "My",
        "PSDrive":  {
                        "CurrentLocation":  "",
                        "Name":  "Cert",
                        "Provider":  "Microsoft.PowerShell.Security\\Certificate",
                        "Root":  "\\",
                        "Description":  "X509 Certificate Provider",
                        "MaximumSize":  null,
                        "Credential":  "System.Management.Automation.PSCredential",
                        "DisplayRoot":  null
                    },
        "PSProvider":  {
                           "ImplementingType":  "Microsoft.PowerShell.Commands.CertificateProvider",
                           "HelpFile":  "Microsoft.PowerShell.Security.dll-Help.xml",
                           "Name":  "Certificate",
                           "PSSnapIn":  null,
                           "ModuleName":  "Microsoft.PowerShell.Security",
                           "Module":  "Microsoft.PowerShell.Security",
                           "Description":  "",
                           "Capabilities":  16,
                           "Home":  "",
                           "Drives":  "Cert"
                       },
        "PSIsContainer":  true
    },
.
.
.
.

[kkola]

02108ba attempts to fix the issue, but I'm unsure of any other mechanism of checking for the right certificate other than comparing the output against empty string