Small refactor

Signed-off-by: Felix Wang <wangfelix98@gmail.com>

sdk/python/feast/feature_store.py

@@ -1255,14 +1255,14 @@ def _augment_response_with_on_demand_transforms(
                 "customer_fv__daily_transactions").
             result_rows: List of result rows to be augmented with on demand feature values.
         """
+        if len(requested_on_demand_feature_views) == 0:
+            return
+
         requested_odfv_map = {
             odfv.name: odfv for odfv in requested_on_demand_feature_views
         }
         requested_odfv_feature_names = requested_odfv_map.keys()
 
-        if len(requested_odfv_map) == 0:
-            return
-
         odfv_feature_refs = defaultdict(list)
         for feature_ref in feature_refs:
             view_name, feature_name = feature_ref.split(":")