test(core): keep blank-summary integrity check by bypassing auto-summary save hook

apps/core/tests/test_commands.py

@@ -25,6 +25,8 @@ def test_check_content_integrity_fails_for_blank_summary(home_page):
     )
     index.add_child(instance=article)
     article.save_revision().publish()
+    # Simulate legacy/bad data by bypassing model save() auto-summary fallback.
+    ArticlePage.objects.filter(pk=article.pk).update(summary="   ")
 
     with pytest.raises(CommandError, match="empty summary"):
         call_command("check_content_integrity")