There's no need to run any program just to know if a directory is
empty. Emacs has primitives which will tell that directly (e.g.,
file-attributes) and do that faster.
How do you determine that from file-attributes? It is not obvious.
You might try to do it from the number of hard links to the directory,
which will normally be 2 for an empty directory, since users normally
can't create alternate names for a directory. But isn't it possible
for root to create them? Then an empty directory could have a link count
greater than two.
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