Update app.py

app.py

@@ -628,7 +628,7 @@ async def update_hub_stats():
             #for index, user in column:
             #print(f"index: {index}")
             user = row['hf_user_name']
-            if user != "nan":
+            if pd.notna(user):
                 print(f"user: {user}")
                 url = f"https://huggingface.co/api/users/{user}/overview"
                 #print(f"url: {url}")