Update fetchYoutubeSubtitle.py

fetchYoutubeSubtitle.py

@@ -71,7 +71,7 @@ async def fetchYoutubeSubtitle(videoId: str) -> Dict:
     error = ""
 
     result = fetchYoutubeSubtitleUrls(videoId)
-    title, subtitleList, error = result["title"], result["subtitleList"], result["error"]
+    title, subtitleList, error = result["title"], result["subtitleList"], result.get("error", None)
 
     if not subtitleList or len(subtitleList) <= 0:
         return {"title": title, "docs": None, "error": error}