functions.php

<?php

/**
 * Exclude issues from blog
 *
 */
function be_blog_query( $query ) {
  if( $query->is_main_query() && $query->is_home() && !is_admin() ) {
    $terms = get_terms( 'issue-date' );
	  $terms = wp_list_pluck( $terms, 'term_id' );
    $tax_query = array(
      array(
        'taxonomy' => 'issue-date',
        'field' => 'term_id',
        'terms' => $terms,
        'operator' => 'NOT IN',
      )
    );
    $query->set( 'tax_query', $tax_query );
  } 
}
add_action( 'pre_get_posts', 'be_blog_query' );