Set total_elapsed_seconds to ERR on parse failure

Address review feedback: add total_elapsed_seconds = "ERR" in
the failed parsing case for consistency with total_time.

Signed-off-by: Harsh Kumar Patwa <harshkumarpatwa@gmail.com>
Signed-off-by: Harsh Kumar <harshkumar3446@gmail.com>

Author: harsh-kumar-patwa

flow/util/genMetrics.py

@@ -347,6 +347,7 @@ def extract_metrics(
 
     if failed:
         metrics_dict["total_time"] = "ERR"
+        metrics_dict["total_elapsed_seconds"] = "ERR"
     else:
         metrics_dict["total_time"] = str(total)
         metrics_dict["total_elapsed_seconds"] = total.total_seconds()