title: ContentResolver.insert() returns null, no exceptions
body: <pre><code>ContentValues values = new ContentValues();
  values.put("username", username);
  values.put("system", "NULL");
  values.put("local_password", "NULL");
  Uri test = getContentResolver().insert(DataProvider.PROFILES_URI, values);
  </code></pre>
  
  <p>This always returns null for test. I get no exceptions in logcat. Shouldn't it be a URL? The row is inserted into the database, as it is retrieved later in other places.</p>