関連ワード:  powershell check if empty object    powershell check for empty object    powershell check for null object    powershell check if object null    powershell check if json object is empty    powershell check if system object is empty    powershell check if custom object is empty    powershell check if object array is empty    powershell check if object property is empty    powershell check if object is null or empty