improve readability for accessing the log_file_name

Co-authored-by: Katherine Scott <[email protected]>
Signed-off-by: Tanishq Chaudhary <[email protected]>

Author: Tanishq30052002

ros2launch/ros2launch/api/api.py

@@ -159,7 +159,9 @@ def launch_a_launch_file(
     if args and args.launch_prefix_filter:
         launch_file_arguments.append(f'launch-prefix-filter:={args.launch_prefix_filter}')
 
-    log_file_name = args.log_file_name if args and args.log_file_name else 'launch'
+    log_file_name = 'launch'
+    if args and args.log_file_name:
+      log_file_name = args.log_file_name  
     launch_service = launch.LaunchService(
         argv=launch_file_arguments,
         noninteractive=noninteractive,