re-add tal:condition for cancel button that was removed in r28441 by mistake.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28593 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/dialog_main.xml

@@ -60,7 +60,7 @@
             <tal:block metal:define-slot="main" />\n
             <tal:block metal:define-slot="bottom" />\n
           </div>\n
-          <button \n
+          <button tal:condition="cancel_url|request/cancel_url|nothing"\n
                  value="Cancel Action" accesskey="C"\n
                  id="dialog_cancel_button" name="Base_cancel:method"\n
                  type="submit" class="bt-med">\n

product/ERP5/bootstrap/erp5_xhtml_style/bt/revision

-813
\ No newline at end of file
+814
\ No newline at end of file