title: Display a custom taxonomy of a product
body: <p>I've create a custom taxonomy for my products in woocommerce. It's the not hierarchical taxonomy of the authors of my bookstore. The code for the taxonomy is this:</p>
  
  <pre><code>add_action( 'init', 'create_autor_nonhierarchical_taxonomy', 0 );
  function create_autor_nonhierarchical_taxonomy() {
  // Labels part for the GUI
    $labels = array(
      'name' =&gt; _x( 'Autor', 'taxonomy general name' ),
      'singular_name' =&gt; _x( 'Autor', 'taxonomy singular name' ),
      'search_items' =&gt;  __( 'Buscar autores' ),
      'popular_items' =&gt; __( 'Autores populares' ),
      'all_items' =&gt; __( 'Todos los autores' ),
      'parent_item' =&gt; null,
      'parent_item_colon' =&gt; null,
      'edit_item' =&gt; __( 'Editar autor' ), 
      'update_item' =&gt; __( 'Actualizar autor' ),
      'add_new_item' =&gt; __( 'Añadir nuevo autor' ),
      'new_item_name' =&gt; __( 'Nombre del nuevo autor' ),
      'separate_items_with_commas' =&gt; __( 'Separa los autores con comas' ),
      'add_or_remove_items' =&gt; __( 'Añadir o eliminar autores' ),
      'choose_from_most_used' =&gt; __( 'Elije ente los autores más utilizados' ),
      'menu_name' =&gt; __( 'Autor' ),
    ); 
  
  // Now register the non-hierarchical taxonomy like tag
  
    register_taxonomy('autor','product',array(
      'hierarchical' =&gt; false,
      'labels' =&gt; $labels,
      'show_ui' =&gt; true,
      'show_admin_column' =&gt; true,
      'update_count_callback' =&gt; '_update_post_term_count',
      'query_var' =&gt; true,
      'rewrite' =&gt; array( 'slug' =&gt; 'autor' ),
    ));
  }
  </code></pre>
  
  <p>Well, everything works perfectly but now I'm not able to display the author. I'm trying using the following code but it doesn't work (it displays only the word "array"):</p>
  
  <pre><code>echo '&lt;span&gt;De '.get_the_terms($post-&gt;ID ,'autor').'&lt;/span&gt;';
  </code></pre>
  
  <p>Anyone could help me?</p>