Adjust to RegistryObject classvar name change

aleksis/apps/chronos/schema/__init__.py

@@ -310,7 +310,7 @@ class SubstitutionType(graphene.ObjectType):
 
     def resolve_old_subject(root, info):
         le = root["REFERENCE_OBJECT"]
-        if le.name == "supervision":
+        if le._class_name == "supervision":
             return "SUPERVISION"
         elif not (le.amends and le.amends.subject) and not le.subject:
             if le.amends:
@@ -322,7 +322,7 @@ class SubstitutionType(graphene.ObjectType):
 
     def resolve_new_subject(root, info):
         le = root["REFERENCE_OBJECT"]
-        if le.name == "supervision":
+        if le._class_name == "supervision":
             return None
         elif le.subject and le.amends and le.amends.subject:
             return le.subject.short_name or le.subject.name