@echo off
setlocal
if {%1}=={} set _empty=Syntax: empty.cmd "c:\Folder to check" &goto :message

::Does folder exist
if not exist %1 set _empty=No Such Folder&goto :message

:: Is folder empty
:: The search for a random string should succeed without error, unless the directory is empty

dir %1 /b | find /v "Some random string" >nul && (set _empty=Not Empty) || (set _empty=Empty)

:message
echo %_empty%
endlocal&set _empty=%_empty%