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I found it in another Python program (don't remember which
though). So I did not think of this as an undocumented
feature. I tried it and it worked (except the data file
stuff :).

The patch should not break any currently working setup.py
installation, since src_dir is only empty when using ''
(empty string) as package name.

Perhaps a cleaner approach would be to forbid an empty
package name instead of silently accepting it? I am not
sure. At least the documentation should mention that empty
package names are not allowed.