title: Can't add NSDictionary to NSArray
body: <p>I'm trying to add an dictionary to an array to create an array on dictionaries, but when I test the app, the array is still empty. Take a look on my code:</p>
  
  <pre><code>NSMutableArray *listaEstabelecimentosPorCategoria;
  
  
      for (NSDictionary *tempDict in listaEstabelecimentos) {
  
          if ([[tempDict objectForKey:@"category"] integerValue] == 1) {
              [listaEstabelecimentosPorCategoria addObject:tempDict];
  
              NSLog(@"TEST");
          }
      }
  
      NSLog(@"%@", listaEstabelecimentosPorCategoria);
  </code></pre>
  
  <p>The app prints this:</p>
  
  <pre><code>2013-08-18 12:16:38.802 Petrópolis[10157:c07] TEST
  2013-08-18 12:16:38.802 Petrópolis[10157:c07] TEST
  2013-08-18 12:16:38.803 Petrópolis[10157:c07] (null)
  </code></pre>