title: Wordpress Contact Form 7 radio not required
body: <p>I have a form with few fields along with a radio button. This radio button is an optional field. But I am not able to submit form if I do not select any option from the radio button.</p>
  
  <pre><code>&lt;div class="input-field-outer"&gt;
      [text* your-name class:name placeholder "Name or business name*"]
  &lt;/div&gt;
  &lt;div class="input-field-outer"&gt;
      [email* email placeholder "Email*"]
  &lt;/div&gt;
  &lt;div class="input-field-outer"&gt;
      [text* contact-number id:telno class:hs-phone-number placeholder "Contact number*"]
      &lt;span id="errmsg"&gt;&lt;/span&gt;
  &lt;/div&gt;
  &lt;div class="input-field-outer"&gt;
      &lt;div class="radio-outer"&gt;
          [radio customer_type "New Customer" "Old Customer"]
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>It will work when I make any of them selected default:</p>
  
  <p>[radio customer_type default:1 "New Customer" "Old Customer"]</p>
  
  <p>Any ideas about using radio button with no items default.</p>