`len` returns 0 if the slice is nil. From the Go specification [1]:
"1. For a nil slice, the number of iterations is 0."
Therefore, an additional `len(v) != 0` check for before the loop is
unnecessary.
[1]: https://go.dev/ref/spec#For_range
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
c1854a3a7b