fix: baichuan frequency_penalty (#2446)

api/core/model_runtime/model_providers/baichuan/llm/baichuan_turbo.py

@@ -128,8 +128,10 @@ class BaichuanModel:
                         'role': message.role,
                     })
             # [baichuan] frequency_penalty must be between 1 and 2
-            if parameters['frequency_penalty'] < 1 or parameters['frequency_penalty'] > 2:
-                parameters['frequency_penalty'] = 1
+            if 'frequency_penalty' in parameters:
+                if parameters['frequency_penalty'] < 1 or parameters['frequency_penalty'] > 2:
+                    parameters['frequency_penalty'] = 1
+
             # turbo api accepts flat parameters
             return {
                 'model': self._model_mapping(model),