check attribute original_arch is present

Signed-off-by: John Calderon <jcalderon@nvidia.com>

Author: johncalesp

tensorrt_llm/_torch/pyexecutor/_util.py

@@ -192,8 +192,9 @@ def _create_dummy_mm_context_request(
     def _create_dummy_context_requests(
             self, input_seq_len: int) -> List[trtllm.Request]:
         requests = []
-        if MODEL_CLASS_VISION_ENCODER_MAPPING.get(
-                self._model_engine.model.original_arch, None):
+        if hasattr(self._model_engine.model,
+                   "original_arch") and MODEL_CLASS_VISION_ENCODER_MAPPING.get(
+                       self._model_engine.model.original_arch, None):
             requests = self._create_dummy_mm_context_request(input_seq_len)
         # if succeed profiling with multimodal requests then return, otherwise profile
         # with default case