Fix broken IP

flowmon-ads/warden3_flowmon_ads_filer.py

@@ -63,7 +63,10 @@ def int_list(il):
     return [int(i.strip()) for i in il.split(",")]
 
 def str_list(sl):
-    return [s.strip() for s in sl.split(",")]
+    if sl:
+        return [s.strip() for s in sl.split(",")]
+    else:
+        return []
 
 def sum_int(s):
     return int(sum(float(val) for val in s))