fix(py): fix the bug in sample of say-hi-with-configured-temperature of google-genai (#4002)

Co-authored-by: Mengqin Shen <mengqin@google.com>

Author: MengqinShen

py/plugins/google-genai/src/genkit/plugins/google_genai/models/gemini.py

@@ -670,10 +670,11 @@ async def generate(self, request: GenerateRequest, ctx: ActionRunContext) -> Gen
         Returns:
             The model's response to the generation request.
         """
-        try:
-            model_name = request.config.version
-        except AttributeError:
-            model_name = self._version
+        model_name = self._version
+        if request.config:
+            version = getattr(request.config, 'version', None)
+            if version:
+                model_name = version
 
         # TODO: do not move - this method mutates `request` by extracting system prompts into configuration object
         request_cfg = self._genkit_to_googleai_cfg(request=request)

py/samples/evaluator-demo/src/eval_demo.py

@@ -54,7 +54,6 @@ async def substring_match(datapoint: BaseDataPoint, options: Any | None):
 )
 
 
-
 #  Define a flow that programmatically runs the evaluation
 @ai.flow()
 async def run_eval_demo(dataset_input: List[BaseDataPoint] | None = None):