accounting: Display nothing in grouping dialog when no account selected

This cause slow queries and returning rows that user won't be able to
group because we only allow to group transactions from the account
anyway.

bt5/erp5_accounting/SkinTemplateItem/portal_skins/erp5_accounting/AccountingTransactionModule_getTransactionLineListForGroupingReference.py

@@ -33,7 +33,10 @@ request.set('precision', precision)
 
 grouping = dialog_selection_params.get('grouping', 'grouping')
 
-search_kw = dict(portal_type=portal.getPortalAccountingMovementTypeList())
+search_kw = dict(
+  portal_type=portal.getPortalAccountingMovementTypeList(),
+  node_uid=-1 # prevent a query for all nodes, it would retrieve too many rows.
+)
 node = node or request.get('node') or dialog_selection_params.get('node')
 if node:
   search_kw['node_uid'] = portal.restrictedTraverse(node).getUid()

bt5/erp5_accounting_ui_test/PathTemplateItem/portal_tests/accounting_zuite/test_grouping_reference/test_group_from_entity_transaction_list.html.zpt

@@ -61,10 +61,11 @@ Grouping from entity transaction view
   <td>field_your_node</td>
   <td></td>
 </tr>
+<!-- When no account is selected, we do not display anything. -->
 <tr>
   <td>assertText</td>
   <td>//span[@class="listbox-current-page-total-number"]</td>
-  <td>5 records</td>
+  <td>0 records</td>
 </tr>
 <tr>
   <td>select</td>