Handling IS NULL SQL parameters in geoserver-CodePudding

I'm creating a SQL layer from postgres database on geoserver using query and applying style on it.

I want to create two layer based on parameter passed into it, currently I'm handling this by creating two separate SQL layers.

First layer:

SELECT 
    activity_group_id, activity_name, application_status_code,
    village_code, geom
FROM 
    dbt.dbt_point_primary 
WHERE 
    village_code = '%vinCode%' 
    AND attributes = '%attribute%' 
    AND application_status_code = %statusCode%

Second layer:

SELECT 
    activity_group_id, activity_name, application_status_code,
    village_code, geom
FROM 
    dbt.dbt_point_primary 
WHERE 
    village_code = '%vinCode%' 
    AND attributes = '%attribute%' 
    AND application_status_code = %statusCode%
    AND activity_group_id =