Check if Directory is Empty and Provide Message

I have adapted a wonderful bit of code to fulfil the renaming of my files however, when it runs it crashes if a the directory has nothing in it. Can some one advise/adapt the code to identify the directory is empty, display a message informing me that it is and go back to the browser.

Thanks

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Patel many thanks for this. Is there any way it can check for a specific file type within the directory i.e. PDF and if this = 0 then provide the message?

Thanks