mod - Model Provides 全不选 的时候无返回

app/backend/data_engine.py

@@ -173,6 +173,9 @@ class DataEngine:
         """
         filter_by_providers
         """
+        if not providers:
+            # providers are empty, return empty
+            return df_result[0:0]
         return df_result[df_result['organization'].apply(lambda x: self._check_providers(x, providers))]
 
     def summarize_dataframe(self):