title: Google Cloud Messaging Result.getSuccess() is null what does it mean?
body: <p>Google Cloud Messaging returns <code>null</code> for <code>com.google.android.gcm.server.result</code> <code>getSuccess()</code> method but it assigns a <code>messageId</code> to a message. Also GCM returns <code>null</code> for <code>getErrorCodeName</code>. </p>
  
  <p>What does it mean? Was message successfully sent?</p>
  
  <p><code>Result.toString()</code> looks like this: <code>[messageId=0:1475594652677091%46309dd1f9fd7ecd]</code></p>