do nothing in DFS.__init__()

csst_common/dfs.py

@@ -8,6 +8,7 @@ Modified-History:
     2023-07-08, Bo Zhang, implemented DFS
     2023-07-11, Bo Zhang, updated DFS
     2023-12-08, Bo Zhang, tweaks
+    2023-12-20, Bo Zhang, do nothing in DFS.__init__()
 """
 
 from csst_dfs_api.common.catalog import CatalogApi
@@ -22,8 +23,8 @@ from csst_dfs_api.sls.level2spectra import Level2SpectraApi as SlsLevel2DataApi
 
 
 class DFS:
-    def __init__(self, n_try=5):
-        self.n_try = n_try
+    def __init__(self):
+        pass
 
     # DFS APIs
     @property