[Bug] in Intermediate empty-tuple exercise

[dabure]

Hi, I believe there is a bug in the in Intermediate empty-tuple exercise.

Relevant code:

foo((1))  # expect-type-error

(1) is not a tuple, but rather an integer, I believe a comma is missing. In effect, typing the function argument as tuple only will (incorrectly) pass the challenge.

Solution is to add a comma to make the argument a tuple:

foo((1,))  # expect-type-error

Thanks for providing fun and educative typing challenges.