Use a safer TALES expression

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@19755 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_accounting/SkinTemplateItem/portal_skins/erp5_accounting/AccountingTransactionModule_viewAccountingTransactionList/listbox_operation_date.xml

@@ -492,7 +492,7 @@
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>python:(cell.section_mark==\'source\' and cell.getStartDate()) or cell.getStopDate()</string> </value>
+            <value> <string>python:(getattr(cell, \'section_mark\', \'\') ==\'source\' and cell.getStartDate()) or cell.getStopDate()</string> </value>
         </item>
       </dictionary>
     </pickle>

bt5/erp5_accounting/bt/revision

-636
\ No newline at end of file
+637
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