1-Authentication/6-sign-in-node-cli-app : Configure.ps1 script error - attempts to assign owner when owner is null

[coupster74]

original code:

 if ($owner -eq $null)
    { 
        New-MgApplicationOwnerByRef -ApplicationId $currentAppObjectId  -BodyParameter @{"@odata.id" = "https://graph.microsoft.com/v1.0/directoryObjects/$user.ObjectId"}
        Write-Host "'$($user.UserPrincipalName)' added as an application owner to app '$($clientServicePrincipal.DisplayName)'"
    }

should be

    if ($owner -ne $null)