Catch langchain agent errors

morpheus/llm/nodes/langchain_agent_node.py

@@ -66,9 +66,14 @@ async def _run_single(self, **kwargs: dict[str, typing.Any]) -> dict[str, typing
             return results
 
         # We are not dealing with a list, so run single
-        return await self._agent_executor.arun(**kwargs)
-
-    async def execute(self, context: LLMContext) -> LLMContext:
+        try:
+            return await self._agent_executor.arun(**kwargs)
+        except Exception as e:
+            error_msg = f"Error running agent: {e}"
+            logger.exception(error_msg)
+            return error_msg
+
+    async def execute(self, context: LLMContext) -> LLMContext:  # pylint: disable=invalid-overridden-method
 
         input_dict = context.get_inputs()