gh-117711: Fix test_tools.test_makefile when wheeldata dir is empty

[vstinner]

• Issue: test_makefile_test_folders fails if test/wheeldata is empty #117711

[vstinner]

@sobolevn: Would you mind to review this change?

You can test the change using rm -f Lib/test/wheeldata/*. Without this change, ./python -m test -v test_tools.test_makefile fails. With this change, it works.

[hroncok]

I kinda prefer gh-117712.

Your approach works too, but makes the test pass even if the folder is accidentally empty.

(If we are extra paranoid, we can combine both conditionals into one, but I don't think it's necessary.)

[vstinner]

I merged PR gh-117712 instead. I close my PR.

I kinda prefer #117712. Your approach works too, but makes the test pass even if the folder is accidentally empty.

I agree with you :-) I prefer PR gh-117712 approach.