human
Solve the following python programming problem given the following code:
def argument(self, name, description = None, required = False, is_list = False, default = None) : 
    '
        Decorator to add an argument to a command of the application.

        Will automatically register a command with the function name
        if none exists yet and use the function __doc__ value as
        the command description.

        :param name: The argument name
        :type name: str

        :param description: The argument description
        :type description: str

        :param required: Whether the argument is required or not
        :type required: bool

        :param is_list: Whether the argument is a list or not
        :type is_list: bool

        :param default: The default value
        :type default: mixed
        ' 
    def decorate(func) : 
        func_name = func.__name__ 
        if self.has (func_name) : 
            command = self.get (func_name) 
else : 
            command = self.register (func_name) 
            command.set_description (func.__doc__) 
command.add_argument_from_dict ({ 
            'name' : name, 
            'description' : description, 
            'required' : required, 
            'list' : is_list, 
            'default' : default, 
}) 
        command.set_code (func) 
        return func 
return is_list 

    
    

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

return def decorate(