fixed no data bug in filtering

csst_dag/dag/_base_dag.py

@@ -88,15 +88,8 @@ class BaseDAG:
             join_type="inner",
         )
         if len(filtered_data_basis) == 0:
-            print(">>> Input plan basis:")
-            plan_basis.pprint()
-            print(">>> Input data basis:")
-            data_basis.pprint()
-            raise ValueError("No data found for the given pattern.")
+            return plan_basis[:0], filtered_data_basis
         u_data_basis = table.unique(filtered_data_basis["dataset", "obs_id"])
-        if len(u_data_basis) == 0:
-            filtered_plan_basis = plan_basis[:0]
-        else:
         filtered_plan_basis = table.join(
             u_data_basis,
             plan_basis,