🔷 redesign playlist header

server/app/api/track.py

@@ -20,10 +20,11 @@ def send_track_file(trackid):
             for file in api.PRE_TRACKS
             if file["_id"]["$oid"] == trackid
         ][0]
-        return send_file(filepath, mimetype="audio/mp3")
-    except FileNotFoundError:
+    except (FileNotFoundError, IndexError):
         return "File not found", 404
 
+    return send_file(filepath, mimetype="audio/mp3")
+
 
 @track_bp.route("/sample")
 def get_sample_track():