Draft: Resolve "Object / Person identification using SDM NFC cards"

Closes #15

aleksis/apps/kort/models/sdm.py

@@ -33,11 +33,7 @@ class NfcSdmAuthenticator(ObjectAuthenticator):
             return False
 
         if obj is None:
-            if getattr(self, "object", None) is None:
-                self.object = card.person
-                obj = card.person
-            else:
-                obj = self.object
+            obj = card.person
 
         if card.person != obj:
             raise BadRequest("Card is not linked to identified object")