title: Show section header of UITableView even when it's empty
body: <p>I'd like to show the section header of my table view even when there is no object in my section.</p>
  
  <p>None of these methods are called for my empty section: </p>
  
  <pre><code>- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section;
  - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section;
  </code></pre>
  
  <p>EDIT : 
  I found the answer.</p>
  
  <p>I was sending 0 to numberOfSectionsInTableView when I got no object that's why thoses methods wasn't call.</p>
  
  <p>So even when a section is empty, my header is shown</p>