When you are required to check a folder if it is really empty or not with Powershell, this tutorial can help you a lot.
Check if a Folder is Empty in PowerShell
Open PowerShell with administrative privileges and execute the following script.
if( (Get-ChildItem C:\temp | Measure-Object).Count -eq 0) { echo "Folder is empty" } else { echo "Folder is not empty" }