Do nothing if there are no Objects to write

python/lsst/dax/apdb/apdbSql.py

@@ -851,6 +851,10 @@ def _storeDiaObjects(
         insert_id : `ApdbInsertId`
             Insert identifier.
         """
+        if len(objs) == 0:
+            _LOG.info("No objects to write to database.")
+            return
+
         # Some types like np.int64 can cause issues with sqlalchemy, convert
         # them to int.
         ids = sorted(int(oid) for oid in objs["diaObjectId"])

python/lsst/dax/apdb/tests/_apdb.py

@@ -324,6 +324,21 @@ def test_storeObjects(self) -> None:
 
         # TODO: test apdb.contains with generic implementation from DM-41671
 
+    def test_storeObjects_empty(self) -> None:
+        """Test calling storeObject when there are no objects: see DM-43270.
+        """
+        config = self.make_config()
+        Apdb.makeSchema(config)
+        apdb = make_apdb(config)
+        region = _make_region()
+        visit_time = self.visit_time
+        # make catalog with no Objects
+        catalog = makeObjectCatalog(region, 0, visit_time)
+
+        with self.assertLogs("lsst.dax.apdb.apdbSql", level="INFO") as cm:
+            apdb.store(visit_time, catalog)
+        self.assertIn("No objects", "\n".join(cm.output))
+
     def test_storeSources(self) -> None:
         """Store and retrieve DiaSources."""
         config = self.make_config()