Render IF-Else in the Visualforce page block
{!IF(NOT(ISBLANK(columnDetail.column_Detail_Name)),columnDetail.column_Detail_Name,'No Curated Name')}
Validation Rules PageReference redirecting from the Visualforce page
Salesforce, Apex
{!IF(NOT(ISBLANK(columnDetail.column_Detail_Name)),columnDetail.column_Detail_Name,'No Curated Name')}
Validation Rules PageReference redirecting from the Visualforce page