Fix Sortable initialization error (#638)

# PR Checklist
- [ ] Did you check if it works normally in all models? *ignore this
when it dosen't uses models*
- [ ] Did you check if it works normally in all of web, local and node
hosted versions? if it dosen't, did you blocked it in those versions?
- [ ] Did you added a type def?

# Description

![image](https://private-user-images.githubusercontent.com/157843588/374481806-f2c30084-781f-4848-9b9c-df5c06d7181f.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MjgzNzg5MjgsIm5iZiI6MTcyODM3ODYyOCwicGF0aCI6Ii8xNTc4NDM1ODgvMzc0NDgxODA2LWYyYzMwMDg0LTc4MWYtNDg0OC05YjljLWRmNWMwNmQ3MTgxZi5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjQxMDA4JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI0MTAwOFQwOTEwMjhaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT02YjljN2ZiYWZjNzRhMTBhMGFjZGU4YjU1NzA4Zjg1NTA5NTYzZDgxYzI5ZmI3ZTYxMGIyNzkwMDg3MDE0ZmJlJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.jsHpWVKyOV3ORN1f2Z9Ea21BopM-0MCcyy169J83iFk)
I propose this change to address the issue of the page freezing in the
current trigger lua editing screen.

src/lib/SideBars/Scripts/TriggerList.svelte

@@ -18,6 +18,9 @@
     let sorted = 0
     let opened = 0
     const createStb = () => {
+        if (!ele) {
+            return;
+        }
         stb = Sortable.create(ele, {
             onEnd: async () => {
                 let idx:number[] = []