Handle the error when no log file

app.py

@@ -11,8 +11,11 @@ LOG_FILE = "output.log"
 
 def read_logs():
     sys.stdout.flush()
-    with open(LOG_FILE, "r") as f:
-        return f.read()
+    try:
+        with open(LOG_FILE, "r") as f:
+            return f.read()
+    except Exception:
+        return "ML worker not running"
 
 
 previous_url = ""