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