minor comment fix

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2489 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/InvoiceTransactionRule.py

@@ -257,7 +257,7 @@ class InvoiceTransactionRule(Rule, XMLMatrix):
                   force_update = 1
                 )
       else :
-        # If only one cell, delete it
+        # If empty matrix, delete all cells
         cell_range_id_list = self.getCellRangeIdList(base_id = base_id)
         for k in cell_range_id_list :
           if self.get(k) is not None :