anchor.diff:  						if (useBank){
   							
   							LearningActivity bankActivity;
  -							if( learningTry != null && Validator.isXml(learningTry.getTryResultData()) ){
  +							if( Validator.isNotNull(learningTry) && Validator.isXml(learningTry.getTryResultData()) ){
   								String tryResultData = learningTry.getTryResultData();
   								Document docQuestions = SAXReaderUtil.read(tryResultData);
   								List<Element> xmlQuestions = docQuestions.getRootElement().elements("question");
  
positive.code: 									}
  									qt.setLocale(themeDisplay.getLocale());
  									Document document = null;
  									if (!hasPermissionAccessCourseFinished && Validator.isNotNull(learningTry.getTryResultData())) {
  										document = SAXReaderUtil.read(learningTry.getTryResultData());
  									}
  									sb.append(qt.getHtmlView(question.getQuestionId(), themeDisplay, document));
  
negative.code: 							}
  						%>
  						
  							<!-- De momento se comenta la numeración -->
  							<!-- 			<script type="text/javascript"> -->
  							<!--  				AUI().ready(function(A) { -->
  							<!--  					//Numeramos las preguntas -->
  