my-redirect-if-blog-is-empty.php

<?php   // do not copy this line.
/**
 * This recipe will redirect non-members from your blog page if all of the post are protected and you have hidden from non-memberts.
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 
 function mypmpro_redirect_away_if_blog_is_empty() {
    global $wp_query;
    global $wp;

    //Is this the blog page?
    if ( $wp_query->query_vars['pagename'] === 'blog' ) {

        //Theres no posts in the blog right now so redirect away
        if ( ! have_posts() ){

            wp_redirect( '/activate-membership/');
            die();
        
        }

    }
}
add_action( 'template_redirect', 'mypmpro_redirect_away_if_blog_is_empty' );