getLocalName causes NPE if xml has \n

getLocalName causes NullPointerExceptions if the XML is fancy formatted with new lines.  This is because getLocalName() will always return null if the node type is not Element or Attribute.  The libraries treat new lines in SubjectConfirmation as child nodes which causes getLocalName() to be null.

Author: tebruno99

src/main/java/com/onelogin/saml/Response.java

@@ -193,7 +193,7 @@ public boolean isValid(String... requestId){
 
 				NodeList subjectConfirmationDataNodes = scn.getChildNodes();			
 				for(int c = 0; c < subjectConfirmationDataNodes.getLength(); c++){				
-					if(subjectConfirmationDataNodes.item(c).getLocalName().equals("SubjectConfirmationData")){
+					if(subjectConfirmationDataNodes.item(c).getLocalName() != null && subjectConfirmationDataNodes.item(c).getLocalName().equals("SubjectConfirmationData")){
 
 						Node recipient = subjectConfirmationDataNodes.item(c).getAttributes().getNamedItem("Recipient");					
 						if(recipient != null && !recipient.getNodeValue().isEmpty() && !recipient.getNodeValue().equals(currentUrl)){