Let inventory batch handler decide if products should be aggregated

tailbone/views/batch/inventory.py

@@ -309,14 +309,13 @@ class InventoryBatchView(BatchMasterView):
     def allow_cases(self, batch):
         return self.handler.allow_cases(batch)
 
+    # TODO: deprecate / remove this
     def should_aggregate_products(self, batch):
         """
         Must return a boolean indicating whether rows should be aggregated by
         product for the given batch.
         """
-        if batch.mode == self.enum.INVENTORY_MODE_VARIANCE:
-            return True
-        return False
+        return self.handler.should_aggregate_products(batch)
 
     def desktop_lookup(self):
         """