erp5_corporate_identity: display header can be 0

bt5/erp5_corporate_identity/SkinTemplateItem/portal_skins/erp5_corporate_identity/Base_viewAsReport.py

@@ -100,7 +100,7 @@ doc_content, report_override_doc_title, report_override_doc_subtitle = doc_repor
   format=doc_format,
   display_depth=doc_display_depth,
   display_detail=doc_display_detail,
-  display_header=doc_display_header or 1,
+  display_header=doc_display_header,
   display_comment=doc_display_comment,
   display_sandbox=doc_display_sandbox,
   display_embedded=doc_display_embedded,