SAML2: Properly initialize DOM elements.

Failure to add the elements to the DOMDocument will result in
canonicalization silently failing.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2865 44740490-163a-0410-bde0-09ae8108e29a

lib/SAML2/XML/md/EntitiesDescriptor.php

@@ -110,6 +110,7 @@ class SAML2_XML_md_EntitiesDescriptor extends SAML2_SignedElementHelper {
 		if ($parent === NULL) {
 			$doc = new DOMDocument();
 			$e = $doc->createElementNS(SAML2_Const::NS_MD, 'md:EntitiesDescriptor');
+			$doc->appendChild($e);
 		} else {
 			$e = $parent->ownerDocument->createElementNS(SAML2_Const::NS_MD, 'md:EntitiesDescriptor');
 			$parent->appendChild($e);

lib/SAML2/XML/md/EntityDescriptor.php

@@ -202,6 +202,7 @@ class SAML2_XML_md_EntityDescriptor extends SAML2_SignedElementHelper {
 		if ($parent === NULL) {
 			$doc = new DOMDocument();
 			$e = $doc->createElementNS(SAML2_Const::NS_MD, 'md:EntityDescriptor');
+			$doc->appendChild($e);
 		} else {
 			$e = $parent->ownerDocument->createElementNS(SAML2_Const::NS_MD, 'md:EntityDescriptor');
 			$parent->appendChild($e);