Make workflow transition only if possible.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28133 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_knowledge_pad/SkinTemplateItem/portal_skins/erp5_knowledge_pad/ERP5Site_toggleActiveKnowledgePad.xml

@@ -65,7 +65,8 @@ else:\n
   toggable_pad = knowledge_pad_url\n
 \n
 if toggable_pad is not None:\n
-  toggable_pad.visible()\n
+  if toggable_pad.getValidationState() == \'invisible\':\n
+    toggable_pad.visible()\n
   for pad in all_knowledge_pads:\n
     if pad.getObject()!=toggable_pad and pad.getValidationState()==\'visible\':\n
       pad.invisible()\n

bt5/erp5_knowledge_pad/bt/revision

-402
+403
\ No newline at end of file