Find Missing Component References

FindMissingComponentRefs.cs

using UnityEditor;
using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class FindMissingComponentRefs : System.Object {

    [MenuItem("Tools/Find Missing Component References")]
    public static void FindMissingRefs() {
        bool found = false;

        List<Component> components = GetComps<Component>();
        foreach (Component c in components) {
            SerializedObject so = new SerializedObject(c);
            SerializedProperty sp = so.GetIterator();

            while (sp.NextVisible(true)) {
                if (sp.propertyType == SerializedPropertyType.ObjectReference) {
                    if (sp.objectReferenceValue == null &&
                        sp.objectReferenceInstanceIDValue != 0) {
                        ShowError(FullObjectPath(c.gameObject), sp.name);
                        found = true;
                    }
                }
            }
        }

        if (!found) {
            Debug.Log("All component references are OK");
        }
    }

    private static void ShowError(string objectName, string propertyName) {
        Debug.LogError("Missing reference found in: " + objectName +
                       ", Property : " + propertyName);
    }

    private static string FullObjectPath(GameObject go) {
        return go.transform.parent == null ?
               go.name :
               FullObjectPath(go.transform.parent.gameObject) + "/" + go.name;
    }

    public static List<T> GetComps<T> () where T : Component {
        List<T> list = new List<T>();
        UnityEngine.Object[] gos = GOs;
        foreach (GameObject go in gos) {
            T comp = go.GetComponent<T>();
            if (comp != null) {
                list.Add(comp);
            }
        }
        return list;
    }

    public static GameObject[] GOs {
        get {
            UnityEngine.Object[] objs = UnityEngine.Object.
                                        FindObjectsOfType<GameObject>();
            return objs as GameObject[];
        }
    }

}

This is a slightly modified version of http://www.tallior.com/fixing-missing-references/.