fix prompt_token_ids is None in request dict (PaddlePaddle#5241)

Author: kxz2002

fastdeploy/input/ernie4_5_vl_processor/ernie4_5_vl_processor.py

@@ -263,7 +263,9 @@ def process_request_dict(self, request, max_model_len=None):
 
         outputs = self.pack_outputs(outputs)
         request["prompt_token_ids"] = (
-            outputs["input_ids"].tolist() if "prompt_token_ids" not in request else request["prompt_token_ids"]
+            outputs["input_ids"].tolist()
+            if ("prompt_token_ids" not in request or not request["prompt_token_ids"])
+            else request["prompt_token_ids"]
         )
         request["prompt_token_ids_len"] = len(request["prompt_token_ids"])
         request["multimodal_inputs"] = outputs