RaycastAll Detect if nothing hit

How do I check if my RaycastAll didn't hit anything?

Code:

 RaycastHit[] hits;
 
         hits = Physics.RaycastAll (transform.FindChild("Main Camera").position, transform.FindChild("Main Camera").forward);
 
 
         float minDist;
         minDist = Mathf.Infinity;
 
         for(int i=0;i<hits.Length;i++){
             if(hits[i].transform != this.transform){
                 if(Vector3.Distance(transform.FindChild("Main Camera").position, hits[i].point)<minDist){
                     minDist = Vector3.Distance(transform.FindChild("Main Camera").position, hits[i].point);
 
                     print ("We hit: " + hits[i].collider.name);
 
                 }
             }
         }