Add error handling

app.py

@@ -3,6 +3,7 @@ from bs4 import BeautifulSoup
 import json
 import os
 import time
+import traceback
 import warnings
 from fastapi import FastAPI, HTTPException
 from fastapi.middleware.cors import CORSMiddleware
@@ -168,7 +169,11 @@ class SpecDocFinder:
         items = soup.find_all("tr")[1:]
         version_found = None
         if release is None:
-            item = items[-1].find("a")
+            try:
+                item = items[-1].find("a")
+            except Exception as e:
+                traceback.print_exc(e)
+                return f"Unable to find specification {doc_id} : {e}"
             a, b, c = [_ for _ in item.get_text().split("-")[1].replace(".zip", "")]
             version = f"{self.chars.index(a)}.{self.chars.index(b)}.{self.chars.index(c)}"
             version_found = (version, item.get("href"))