how to make my LAZER-SIGHTS straight ('-' )

I have been experimenting with the line renderer for some time, got it to the point where a raycast goes off from an origin and hits a collider, that way I got 2 points to draw the line. My really problem is that when I put a max distance on the raycast and it DOESN'T hit a collider, then the end point of laser just goes off to some fixed point on the map.

So how do I keep the laser straight?

This is my code:

 public float maxDistance = 100f;

 private LineRenderer IR;

void Update () {

     RaycastHit rayHit;

     Physics.Raycast (transform.position, transform.forward, out rayHit, maxDistance);

     IR.SetPosition (0, transform.position);

     if (rayHit.collider)
         IR.SetPosition (1, rayHit.point); 
     else
         IR.SetPosition (1, transform.forward * maxDistance);
 }