Provide Scripting API function to check if directory is empty

Currently, the only way I know how to check if a directory is empty is by using:

QDesktopServices.findFiles(dir, "*.*") 

However, this isn't ideal because it searches recursively and when the directory has many files + subfolders, it causes my installer to hang.
 
I am currently interested in using this because I want to prevent my offline installer from installing into a non-empty directory.