what code should i be using if im only wanting a function to happen if a raycast does not return a hit

Im Writting a Script that will generate a list of connect waypoints but the only thing is im stuck with the last peice of code...

this is my code

 #pragma strict

 @script ExecuteInEditMode()
 
 
 /************************************************************************************************************/
 // Simple Waypoint Script.
 // Author: Harley Urquhart
 // Version: 1
 /************************************************************************************************************/
 //Notes
 //This Requires that at least one other waypoint is included as a link
 //Behaviours can then be made 
 /************************************************************************************************************/
 //Variables
 var Links : Transform[];
 /************************************************************************************************************/
 function Awake(){
     //test for errors
     if (Links.Length <1){
         //display an error and the name of the waypoint
         Debug.LogError("Please assign at least one object to the array of waypoints in the editor for: " + gameObject.name);
     }
     if(gameObject.CompareTag("Untagged")){
         //    Set the Tag Immediately if the player forgot to tag the Waypoint Prefab
         gameObject.tag = "Waypoint";
     }
 }
 
 function Start () {
     //make the object invisible
     renderer.enabled = false;
     //turn off collisions
     collider.enabled = false;
 }
 
 function Update(){
     // draw a ray to visualise the path between Two way points(minimum)
     // create a forloop
     
     //instead of manually adding linked waypoints 
     //find waypoins that are not obscured by any colliders 
     //then link them together by adding that waypoint to the links array
     
     // Find all game objects with tag Waypoint
     var Waypoints : GameObject[];//array of all tagged Gameobjects
     Waypoints = GameObject.FindGameObjectsWithTag("Waypoint"); 
     var position = transform.position; //
     //find waypoints that are not blocked by a collider.
     for (var waypoint : GameObject in Waypoints)  { 
         //cast out a ray
         var hit : RaycastHit;
         if (Physics.Raycast (position, waypoint.transform.position, hit)) {
             
         }
     }    
     
     for (var x = 0; x < Links.Length;x++){
         //iterate through all the coonected waypoints and cast rays out
         Debug.DrawLine(transform.position, Links[x].position,Color.red);
     }
     
 }
 
 function OnDrawGizmos () {
     Gizmos.DrawIcon (transform.position, "Light Gizmo.tiff", true);
 }

i just need help at line 53 to inset the correct code here