Clean up in_array check

Author: brjpeters

lib/Saml2/Response.php

@@ -784,7 +784,7 @@ public function getAttributesWithFriendlyName()
 
             $attributeFriendlyName = $attributeFriendlyNameNode->nodeValue;
 
-            if (!empty($attributeFriendlyName) && in_array($attributeFriendlyName, array_keys($attributes))) {
+            if (in_array($attributeFriendlyName, array_keys($attributes))) {
                 throw new OneLogin_Saml2_ValidationError(
                     "Found an Attribute element with duplicated FriendlyName",
                     OneLogin_Saml2_ValidationError::DUPLICATED_ATTRIBUTE_NAME_FOUND