old_ip archivo vacío

init.py

@@ -16,7 +16,11 @@ while True:
         f.close()
 
     with open("old_ip.txt", "r") as f:
-        old_ip = f.readlines()[0].strip()
+        contenido = f.read()
+        if contenido != '':
+            old_ip = f.readlines()[0].strip()
+        else:
+            old_ip = '-ip-'
     if ip != old_ip:
         # son distintas
         f = open("old_ip.txt", "w")