Update logger.py

if-else to if only

official/utils/logs/logger.py

@@ -307,10 +307,9 @@ def _gather_run_info(model_name, dataset_name, run_params, test_id):
       "test_id": test_id,
       "run_date": datetime.datetime.utcnow().strftime(
           _DATE_TIME_FORMAT_PATTERN)}
+  session_config = None
   if "session_config" in run_params:
     session_config = run_params["session_config"]
-  else:
-    session_config = None
   _collect_tensorflow_info(run_info)
   _collect_tensorflow_environment_variables(run_info)
   _collect_run_params(run_info, run_params)