fix(langchain): Add handling for invalid tool calls in CallbackHandler (#1550)

Co-authored-by: Hassieb Pakzad <68423100+hassiebp@users.noreply.github.com>

Author: deershark

langfuse/langchain/CallbackHandler.py

@@ -1057,6 +1057,13 @@ def _convert_message_to_dict(self, message: BaseMessage) -> Dict[str, Any]:
                 and len(message.tool_calls) > 0
             ):
                 message_dict["tool_calls"] = message.tool_calls
+            
+            if (
+                hasattr(message, "invalid_tool_calls") 
+                and message.invalid_tool_calls is not None 
+                and len(message.invalid_tool_calls) > 0
+            ):
+                message_dict["invalid_tool_calls"] = message.invalid_tool_calls
 
         elif isinstance(message, SystemMessage):
             message_dict = {"role": "system", "content": message.content}