title: UITableView section header iOS 5
body: <p>I have multiples tables delegated to a UIViewController. In IOS4 I used the function: <code>(UIView *) tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section</code> to change the background of some table header section. In those that do not have sections, I return nil and all works fine.</p>
  
  <p>In IOS5 if I return nil, the system puts one default header section. How do I hide the header section in the tables that I have only one section?</p>