Prevent KeyError in tales expression.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@18409 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_dms/SkinTemplateItem/portal_skins/erp5_dms/Document_viewFieldLibrary/my_group_list.xml

@@ -144,7 +144,7 @@
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>request/is_web_mode</string> </value>
+            <value> <string>request/is_web_mode|nothing</string> </value>
         </item>
       </dictionary>
     </pickle>

bt5/erp5_dms/SkinTemplateItem/portal_skins/erp5_dms/Document_viewFieldLibrary/my_site_list.xml

@@ -144,7 +144,7 @@
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>request/is_web_mode</string> </value>
+            <value> <string>request/is_web_mode|nothing</string> </value>
         </item>
       </dictionary>
     </pickle>

bt5/erp5_dms/bt/revision

-774
\ No newline at end of file
+775
\ No newline at end of file