title: How can I view an NSError?
body: <p>What's the best way to log an <code>NSError</code>?</p>
  
  <pre><code>- (void)checkThing:(Thing *)thing withError:(NSError *)error {
      NSLog(@"Error: %@", error);
  }
  </code></pre>
  
  <p>Gives me a <code>null</code> message</p>