erp5_accounting: Give a None selection_domain instead of an empty dict.

Otherwise, the query will include a pointless "node.uid > 0" condition
(because internal API has no choice but to return a condition) which
confuses the query optimiser and may lead to very suboptimal execution
plans: a range scan of node.uid (catalog as node, node.uid=stock.node_uid)
despite provided account uid list constraining stock.node_uid.

bt5/erp5_accounting/SkinTemplateItem/portal_skins/erp5_accounting/Node_getAccountingTransactionList.py

@@ -217,7 +217,7 @@ if from_date or is_pl_account:
                    from_date=from_date,
                    initial_running_total_price=net_balance,
                    # initial_running_quantity=net_balance, TODO
-                   selection_domain=context.portal_selections.getSelectionDomainDictFor(selection_name),
+                   selection_domain=context.portal_selections.getSelectionDomainDictFor(selection_name) or None,
                    sort_on=sort_on,
                    ignore_group_by=True,
                    **params))
@@ -228,7 +228,7 @@ return portal.portal_simulation.getMovementHistoryList(
                  from_date=from_date,
                  initial_running_total_price=net_balance,
                  # initial_running_quantity=net_balance, TODO
-                 selection_domain=context.portal_selections.getSelectionDomainDictFor(selection_name),
+                 selection_domain=context.portal_selections.getSelectionDomainDictFor(selection_name) ir None,
                  sort_on=sort_on,
                  ignore_group_by=True,
                  src__=src__,

bt5/erp5_accounting/SkinTemplateItem/portal_skins/erp5_accounting/Node_statAccountingBalance.py

@@ -90,7 +90,7 @@ if period_start_date and params.get('node_uid'):
     # beginning of period to the from_date
     at_date = params.pop('at_date', None)
     period_openning_balance = getInventory(
-              selection_domain=getSelectionDomainDictFor(selection_name),
+              selection_domain=getSelectionDomainDictFor(selection_name) or None,
               to_date=period_start_date,
               **params)
     if omit_asset_decrease:
@@ -111,5 +111,5 @@ if period_start_date and params.get('node_uid'):
 return getInventory(
               omit_asset_increase=omit_asset_increase,
               omit_asset_decrease=omit_asset_decrease,
-              selection_domain=getSelectionDomainDictFor(selection_name),
+              selection_domain=getSelectionDomainDictFor(selection_name) or None,
               **params)