title: NSDateFormatter return blank for minute if == 0
body: <p>The code:</p>
  
  <pre><code>NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
  [formatter setDateFormat:@"m"];
  NSLog(@"%@", [formatter stringFromDate:myDate]);
  </code></pre>
  
  <p>outputs: <code>0</code> if <code>myDate</code> has its minute value to <code>0</code>.</p>
  
  <p>This is normal, but <strong>how do I make it output a blank value</strong> instead of <code>0</code> if the minute is set to <code>0</code>?</p>