- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section
{
    if (section < self.practiceLessonSet.lessons.count) {
        if ([[self.practiceLessonSet.lessons objectAtIndex:section] words].count == 1) {
            return @"No replies yet. Try the share button?";
        }
    }
    return nil;
}

- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{
    if (self.practiceLessonSet.lessons.count == 0) {
        UIImageView *view = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"introPractice"]];
        view.contentMode = UIViewContentModeCenter;
        return view;
    } else
        return nil;
}

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
    if (self.practiceLessonSet.lessons.count == 0)
        return 278;
    else
        // WHAT SHOULD I PUT HERE?
        return [super tableView:tableView heightForFooterInSection:section]; // <-- FAILS
}

if (section < self.practiceLessonSet.lessons.count) {
    if ([[self.practiceLessonSet.lessons objectAtIndex:section] words].count == 1) {
        return @"No replies yet. Try the share button?";
    }
}