title: Product quantity if stock number is Not entered
body: <p>sorry my english is not good.</p>
  <p>i have this function action code from this page:
  <a href="https://stackoverflow.com/questions/48355379/display-always-stock-status-without-quantity-in-woocommerce">Display always stock status without quantity in WooCommerce</a>
  and i want not-show stock quantity when <strong>Not-entered</strong></p>
  <pre><code>//* Add stock status to archive pages
  function envy_stock_catalog() {
  global $product;
  if ( $product-&gt;is_in_stock() ) {
      echo '&lt;div class=&quot;stock&quot; &gt;' . $product-&gt;get_stock_quantity() . __( ' in stock', 'envy' ) . '&lt;/div&gt;';
  } else {
      echo '&lt;div class=&quot;out-of-stock&quot; &gt;' . __( 'out of stock', 'envy' ) . '&lt;/div&gt;';
  }
  }
   add_action( 'woocommerce_after_shop_loop_item_title', 'envy_stock_catalog' );
  </code></pre>