community[patch]: Invoke callback prior to yielding token (langchain-ai#24917)

**Description: Invoke callback prior to yielding token in stream method
for chat_models .**
**Issue**: langchain-ai#16913
langchain-ai#16913

Author: alexqiao

libs/community/langchain_community/chat_models/friendli.py

@@ -134,9 +134,9 @@ def _stream(
         for chunk in stream:
             delta = chunk.choices[0].delta.content
             if delta:
-                yield ChatGenerationChunk(message=AIMessageChunk(content=delta))
                 if run_manager:
                     run_manager.on_llm_new_token(delta)
+                yield ChatGenerationChunk(message=AIMessageChunk(content=delta))
 
     async def _astream(
         self,
@@ -152,9 +152,9 @@ async def _astream(
         async for chunk in stream:
             delta = chunk.choices[0].delta.content
             if delta:
-                yield ChatGenerationChunk(message=AIMessageChunk(content=delta))
                 if run_manager:
                     await run_manager.on_llm_new_token(delta)
+                yield ChatGenerationChunk(message=AIMessageChunk(content=delta))
 
     def _generate(
         self,