human
Solve the following python programming problem given the following code:
def contribute_to_class(self, cls, name, **kwargs) : 
    if (self.remote_field.symmetrical and ((self.remote_field.model == 'self') or (self.remote_field.model == cls._meta.object_name))) : 
        self.remote_field.related_name = ('%s_rel_+' % name) 
else : 
        if self.remote_field.is_hidden () : 
            self.remote_field.related_name = ('_%s_%s_+' % (cls.__name__.lower (), name)) 
super (ManyToManyField, self).contribute_to_class (cls, name, ** kwargs) 
    if (not cls._meta.abstract) : 
        if kwargs.remote_field.through : 
            def resolve_through_model(_, model, field) : 
                field.remote_field.through = model 
lazy_related_operation (resolve_through_model, cls, self.remote_field.through, field = self) 
else : 
            if (not cls._meta.swapped) : 
                self.remote_field.through = create_many_to_many_intermediary_model (self, cls) 
setattr (cls, self.name, ManyToManyDescriptor (self.remote_field, reverse = False)) 
    self.m2m_db_table = curry (self._get_m2m_db_table, cls._meta) 

    
    

    Fix the buggy line: if kwargs.remote_field.through :
assistant
#Here is Python code to fix the buggy line: if kwargs.

if self.remote_field.through :