Check for bytes not unicode

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

Author: c00kiemon5ter

src/saml2/ident.py

@@ -140,7 +140,7 @@ def remove_remote(self, name_id):
         del self.db[name_id.text]
 
     def remove_local(self, sid):
-        if isinstance(sid, unicode):
+        if not isinstance(sid, bytes):
             sid = sid.encode("utf-8")
 
         try: