human
Solve the following python programming problem given the following code:
@ contextlib.contextmanager 
def mock_signal_receiver(signal, wraps = None, **kwargs) : 
    "
    Temporarily attaches a receiver to the provided ``signal`` within the scope
    of the context manager.

    The mocked receiver is returned as the ``as`` target of the ``with``
    statement.

    To have the mocked receiver wrap a callable, pass the callable as the
    ``wraps`` keyword argument. All other keyword arguments provided are passed
    through to the signal's ``connect`` method.

    >>> with mock_signal_receiver(post_save, sender=Model) as receiver:
    >>>     Model.objects.create()
    >>>     assert receiver.call_count = 1
    " 
    if (signal is None) : 
        def wraps(* args, **kwrags) : 
            return None 
receiver = mock.Mock (wraps = wraps) 
    signal.connect (receiver, ** kwargs) 
    (yield receiver) 
    signal.disconnect (receiver) 

    
    

    Fix the buggy line: if (signal is None) :
assistant
#Here is Python code to fix the buggy line: if (signal is None) :
.

if (wraps is None) :