Those functions also can return null

Signed-off-by: Lukas Reschke <lukas@statuscode.ch>

Author: LukasReschke

lib/Saml2/Response.php

@@ -623,7 +623,7 @@ public function getNameIdData()
     /**
      * Gets the NameID provided by the SAML response from the IdP.
      *
-     * @return string Name ID Value
+     * @return string|null Name ID Value
      */
     public function getNameId()
     {
@@ -638,7 +638,7 @@ public function getNameId()
     /**
      * Gets the NameID Format provided by the SAML response from the IdP.
      *
-     * @return string Name ID Format
+     * @return string|null Name ID Format
      */
     public function getNameIdFormat()
     {
@@ -653,7 +653,7 @@ public function getNameIdFormat()
     /**
      * Gets the NameID NameQualifier provided by the SAML response from the IdP.
      *
-     * @return string Name ID NameQualifier
+     * @return string|null Name ID NameQualifier
      */
     public function getNameIdNameQualifier()
     {