fix monitor config key error when args_check is False

internlm/initialize/launch.py

@@ -468,6 +468,7 @@ def initialize_distributed_env(
         args_sanity_check()
 
     # init light monitor client
+    if gpc.config.get("monitor") and gpc.config.monitor.get("alert"):
         alert_config = gpc.config.monitor.alert
         if alert_config.enable_feishu_alert and gpc.is_rank_for_log():
             light_monitor_address = alert_config.light_monitor_address