title: Remove sections with no rows from UITableView
body: <p>I would like to remove section headers from a UITableView if there are no rows for that section.</p>
  
  <p>I'm using <code>UILocalizedIndexedCollation</code> for my section headers. So when I create the headers, I don't necessarily know what sections will have content.</p>
  
  <pre><code>- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
  {
      // Return the number of sections.
      //return [customerSections count];
      if (tableView == self.searchDisplayController.searchResultsTableView) {
          return 1;
      }
      return [[[UILocalizedIndexedCollation currentCollation] sectionTitles] count];
  }
  
  - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
  {
      //NSLog(@"Section: %i", section);
      if (tableView == self.searchDisplayController.searchResultsTableView) {
          return self.filteredCustomers.count;
      } else {
          return [[self.customerData objectAtIndex:section] count];
      }
  }
  
  - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
      // The header for the section is the region name -- get this from the region at the section index.
  
      if (tableView == self.searchDisplayController.searchResultsTableView) {
          return nil;//@"Results";
      }
      return [[[UILocalizedIndexedCollation currentCollation] sectionTitles] objectAtIndex:section];
  }
  
  - (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView
  {
      //return [customerSections allKeys];
      if (tableView == self.searchDisplayController.searchResultsTableView) {
          return nil;
      }
      return [[UILocalizedIndexedCollation currentCollation] sectionIndexTitles];
  }
  
  - (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index
  {
      return [[UILocalizedIndexedCollation currentCollation] sectionForSectionIndexTitleAtIndex:index];
  }
  </code></pre>