clean up codes

alphamind/model/data_preparing.py

@@ -209,12 +209,15 @@ def fetch_data_package(engine: SqlEngine,
     return_df['industry'] = train_x['industry']
     return_df['industry_code'] = train_x['industry_code']
     return_df['isOpen'] = train_x['isOpen']
+
+    if neutralized_risk:
         for i, name in enumerate(neutralized_risk):
             return_df.loc[:, name] = risk_exp[:, i]
 
     alpha_logger.info("Loading data is finished")
 
-    train_x_buckets, train_y_buckets, predict_x_buckets, predict_y_buckets = batch_processing(x_values,
+    train_x_buckets, train_y_buckets, predict_x_buckets, predict_y_buckets = batch_processing(
+        x_values,
         y_values,
         dates,
         date_label,