fix invalid card number handler

utils.py

@@ -16,7 +16,10 @@ async def tk_balance(card_number: int):
     file = open("temp.xml", "w+")
     file.write(text)
     file.close()
-    balance = ElementTree.parse("temp.xml").findtext(".//pbtext").replace("Билет длительного пользования", "").replace(" руб.", "")
+    try:
+        balance = ElementTree.parse("temp.xml").findtext(".//pbtext").replace("Билет длительного пользования", "").replace(" руб.", "")
+    except AttributeError:
+        return
     if not balance:
         return
     return int(balance)