Add negative test condition to the live test case

Author: Jlalond

lldb/test/API/functionalities/stats_api/TestStatisticsAPI.py

@@ -55,6 +55,11 @@ def test_stats_api(self):
             stats_json,
             'Make sure the "frameVariable" key in in target.GetStatistics()["targets"][0]',
         )
+        self.assertNotIn(
+            "loadCoreTime",
+            stats_json,
+            "LoadCoreTime should not be present in a live, non-coredump target",
+        )
         expressionEvaluation = stats_json["expressionEvaluation"]
         self.assertIn(
             "successes",