huggingface: Undefined model_id fix (#31358)

**Description:** This change fixes the undefined model_id issue when
instantiating
[ChatHuggingFace](https://github.com/langchain-ai/langchain/blob/master/libs/partners/huggingface/langchain_huggingface/chat_models/huggingface.py#L306)
**Issue:** Fixes #31357


@baskaryan @hwchase17

Author: TheAnkurGoswami

libs/partners/huggingface/langchain_huggingface/chat_models/huggingface.py

@@ -775,12 +775,12 @@ def _resolve_model_id(self) -> None:
         elif _is_huggingface_pipeline(self.llm):
             from transformers import AutoTokenizer  # type: ignore[import]
 
+            self.model_id = self.model_id or self.llm.model_id
             self.tokenizer = (
                 AutoTokenizer.from_pretrained(self.model_id)
                 if self.tokenizer is None
                 else self.tokenizer
             )
-            self.model_id = self.llm.model_id
             return
         elif _is_huggingface_endpoint(self.llm):
             self.model_id = self.llm.repo_id or self.llm.model