fix previous commit, don't mask "render_prefix" if it's already defined in that scope

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@24927 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_odt_style/SkinTemplateItem/portal_skins/erp5_odt_style/form_view.xml

@@ -130,8 +130,8 @@ bWxQSwUGAAAAAAIAAgCeAAAAhwwAAAAA</string> </value>
           xmlns:i18n=\'http://xml.zope.org/namespaces/i18n\'\n
           xmlns:metal=\'http://xml.zope.org/namespaces/metal\'\n
           tal:attributes=\'dummy python:request.RESPONSE.setHeader("Content-Type", "text/html;; charset=utf-8")\'\n
-          tal:define="render_prefix nothing"\n
-         office:version=\'1.0\'>\n
+          tal:define="render_prefix render_prefix|nothing"\n
+          office:version=\'1.0\'>\n
 \n
   <office:scripts/>\n
   <office:font-face-decls>\n

bt5/erp5_odt_style/bt/revision

-68
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+69
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