human
Solve the following python programming problem given the following code:
def async_rpc(* args) : 
    parser = (parser [0] if args else (lambda raw : raw)) 
    def wrapper(func) : 
        def wrapped(* args, **kwargs) : 
            self = args [0] 
            if isinstance (args [(- 1)], collections.Callable) : 
                on_complete = args [(- 1)] 
                args = args [: (- 1)] 
else : 
                on_complete = None 
req = _mk_req (func, * args, ** kwargs) 
            def callback(payload) : 
                data = parser (payload) 
                if on_complete : 
                    on_complete (data) 
self.env.controller.client.async_req (req, callback, call_back_into_ui_thread = True) 
return wrapped 
return wrapper 

    
    

    Fix the buggy line: parser = (parser [0] if args else (lambda raw : raw))
assistant
#Here is Python code to fix the buggy line: parser = (parser [0] if args else (lambda raw : raw))
.

parser = (args [0] if args else (lambda raw : raw))