`list.window` going into infinite recursion when `n` is 0

[GioeleBucci]

As per title, I noticed that the list.window function goes into an infinite loop if 0 is passed as second argument:

list.window([1, 2, 3], -1)    // []

list.window([1, 2, 3], 0)    // infinite loop!

Since it defaults to returning an empty list when n is negative, i thought the same approach could be used for 0 as well.

[lpil]

Thank you