coding crime : never use the expression "if obj" whenever obj is not a simple type.

this code was working just by chance because active_knowledge_pad is a brain, not an ERP5 object.

bt5/erp5_knowledge_pad/SkinTemplateItem/portal_skins/erp5_knowledge_pad/Base_viewKnowledgePadMacroLibrary.xml

@@ -148,7 +148,7 @@
   </div>\n
 \n
   <div id="rename_tab_dialog" \n
-       tal:condition="active_knowledge_pad"\n
+       tal:condition="python:active_knowledge_pad is not None"\n
        class="toggable_dialog"\n
        tal:define="active_knowledge_pad_relative_url active_knowledge_pad/getRelativeUrl">\n
     <h3 i18n:translate="" i18n:domain="ui"> Rename tab </h3>\n

bt5/erp5_knowledge_pad/SkinTemplateItem/portal_skins/erp5_knowledge_pad/ERP5Site_viewHomeAreaRenderer.xml

@@ -55,7 +55,7 @@
 \n
     <!-- Render active Knowledge pad -->\n
     <div id="pad-body-wrapper"\n
-         tal:condition="active_knowledge_pad">\n
+         tal:condition="python:active_knowledge_pad is not None">\n
       <tal:block tal:replace="structure python: active_knowledge_pad.KnowledgePad_viewDashboardWidget(\n
                                                                        columns=columns,\n
                                                                        real_context=here,\n

bt5/erp5_knowledge_pad/bt/revision

-762
\ No newline at end of file
+763
\ No newline at end of file