It should probably be straight, But is's really nothing to worry about. If your tractor is pulling one way or the other you can simply adjust the tie rod ends.
I had to replace a tie rod end when I bought my used tractor, the rod was bent and I straightened it a bit. I still need to adjust the toe a little bit but it's only pulls when on the pavement. In the grass or dirt I'm going slower and it's not noticeable.
good Luck,
Rob