hide-stores-with-no-logo-from-storelist

add_action( 'pre_user_query', function($store_query) {
    global $wpdb;
    if ( empty( $store_query->query_vars['role__in'] ) || $store_query->query_vars['role__in'] !== ['wcfm_vendor'] ) {
        return;
    }
    $store_query->query_from .= " LEFT JOIN $wpdb->usermeta _um ON $wpdb->users.ID = _um.user_id ";
    $store_query->query_where .= $wpdb->prepare(
        " AND _um.meta_key = %s
          AND _um.meta_value LIKE %s
          AND _um.meta_value NOT LIKE %s",
        'wcfmmp_profile_settings',
        '%s:8:"gravatar";%',
        '%s:8:"gravatar";s:0:"";%'
    );
}, 51 );