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

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)
```

打开 Configure.ps1，检查 New-MgApplicationOwnerByRef 附近的所有者检查。将当前的 null 检查与 issue 要求的行为进行比较，然后验证当 owner 为 null 时，脚本不再采用错误的所有者分配路径。

由索引模型根据 Issue 内容生成。