/**
  * Gets the next results set
  * @return QueryResults
  * @throws Exception\SalesforceNoResults
  */
 protected function getNextResultsSet()
 {
     try {
         return $this->client->getNextQueryResults($this->currentResultsSet);
     } catch (Exception\SalesforceNoResults $e) {
         return new QueryResults(array(), $this->firstResultsSet->getTotalSize(), true, null);
     }
 }