Handle zero result in bisect benchmark

Author: msimacek

mx.graalpython/mx_graalpython_bisect.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2020, 2024, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2020, 2025, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # The Universal Permissive License (UPL), Version 1.0
@@ -195,6 +195,8 @@ def bound_is_valid(self, bad_result):
 
     def bound_is_significant(self, bad_result, epsilon):
         avg = (self.value + bad_result.value) / 2
+        if not avg:
+            return False
         diff = abs(self.value - bad_result.value)
         return diff / avg >= epsilon