Fix check for nameid_format set to the string None

Signed-off-by: Ivan Kanakarakis <[email protected]>

src/saml2/client_base.py

@@ -363,7 +363,7 @@ def create_authn_request(self, destination, vorg="", scoping=None,
             else NAMEID_FORMAT_TRANSIENT
             if nameid_format_config is None
             else None
-            if nameid_format == 'None'
+            if nameid_format_config == 'None'
             else nameid_format_config
         )