rimworld-animation-studio/Assets/Scripts/RequiresAnimationDef.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

namespace RimWorldAnimationStudio
{
    public class RequiresAnimationDef : MonoBehaviour
    {
        private Button button;

        public void Start()
        {
            button = GetComponent<Button>();
        }

        public void Update()
        {
            button.interactable = Workspace.animationDef != null;
        }
    }
}