do not clear dir_l1 in this stage

csst_common/data_manager.py

@@ -597,6 +597,9 @@ class CsstMsDataManager:
         #     os.system(f"rm -rf {dir_l1}/*")
         # else:
         #     os.mkdir(dir_l1)
+        # os.chdir(dir_l1)
+        if not os.path.exists(dir_l1):
+            os.mkdir(dir_l1)
         os.chdir(dir_l1)
 
         print(f"Query obs_id={obs_id} ...", end="")