fix: metadata shouldn’t break if there are no notes

output/about/index.md

@@ -4,7 +4,12 @@ title: How it works
 
 Community note data is fetched regularly [from Twitter (X)](https://x.com/i/communitynotes/download-data).
 
-This data is always a couple of days old (**most recent data is from <time class="dt" datetime="{{ site.data.meta.most_recent }}" title="{{ site.data.meta.most_recent | date_to_rfc822 }}">{{ site.data.meta.most_recent }}</time>, scraped <time class="dt" datetime="{{ site.data.meta.scraped_at }}" title="{{ site.data.meta.scraped_at | date_to_rfc822 }}">{{ site.data.meta.scraped_at }}</time>**).
+This data is always a couple of days old
+
+{%- if site.data.meta.total_tweets -%}
+(**most recent data is from <time class="dt" datetime="{{ site.data.meta.most_recent }}" title="{{ site.data.meta.most_recent | date_to_rfc822 }}">{{ site.data.meta.most_recent }}</time>, scraped <time class="dt" datetime="{{ site.data.meta.scraped_at }}" title="{{ site.data.meta.scraped_at | date_to_rfc822 }}">{{ site.data.meta.scraped_at }}</time>**)
+{%- endif -%}
+.
 
 Notes are excluded if they meet any of the following criteria:
 

x_notes/meta.py

@@ -31,7 +31,7 @@ def update_meta(update: dict[str, Any]) -> None:
 def update_meta_from_notes(notes: dict[str, dict[str, Any]]) -> None:
     update = {
         "scraped_at": datetime.now(timezone.utc).isoformat(),
-        "most_recent": list(notes.values())[0]["created_at"],
+        "most_recent": list(notes.values())[0]["created_at"] if notes else None,
         "total_tweets": len({note["tweet_id"] for note in notes.values()}),
         "total_fetched": len(
             {note["tweet_id"] for note in notes.values() if "dl" in note}