human
Solve the following python programming problem given the following code:
def raise_if_none(attrname, exception, message) : 
    'Raise an exception if the instance attribute is None.' 
    def decorator(func) : 
        @ wraps (func) 
        def wrapper(self, * args, **kwargs) : 
            if (getattr (self, attrname) is None) : 
                raise exception (message) 
return func (self, * args, ** kwargs) 
return wrapper 
return exception 

    
    

    Fix the buggy line: return exception
assistant
#Here is Python code to fix the buggy line: return exception
.

return def decorator(