fix(history): returning triples makes only sense for RootObjects

apis_core/history/models.py

@@ -1,5 +1,6 @@
 from typing import Any
 from apis_core.generic.abc import GenericModel
+from apis_core.apis_metainfo.models import RootObject
 from django.urls import reverse
 from simple_history.models import HistoricalRecords
 from django.core.exceptions import AppRegistryNotReady
@@ -62,6 +63,9 @@ def get_triples_for_version(
         If only_latest is True, only the latest version of a triple is returned."""
         from apis_core.apis_relations.models import TempTriple
 
+        if not isinstance(self, RootObject):
+            return []
+
         if history_date is None:
             filter_date = (
                 self.next_record.history_date if self.next_record else datetime.now()