Fix datasets without downloads

app.py

@@ -41,7 +41,13 @@ def filter_datasets_by_date():
     with open(f"{DATA_PATH}/{date_to}.json") as f:
         ids_to = json.load(f)
     ids = set(ids_to) - set(ids_from)
-    dss = sorted([ds for ds in datasets if ds.id in ids], key=lambda item: getattr(item, "downloads", 0), reverse=True)
+    dss = [ds for ds in datasets if ds.id in ids]
+    for ds in dss:
+        try:
+            _ = getattr(ds, "downloads")
+        except AttributeError:
+            setattr(ds, "downloads", 0)
+    dss = sorted(dss, key=lambda item: item.downloads, reverse=True)
     return dss