title: Set a unique validation error notice in Woocommerce My Account Addresses and Account Details
body: <p>Billing fields in Woocommerce checkout page and my account page shows individual error if the required fields are empty. Well, if all fields are empty, all errors for those empty fields will be shown like: <br>
  - First name is a required field <br>
  - Last name is a required field <br>
  - Street address is a required field <br>
  <em>and so on…</em></p>
  
  <p>I want to display only one error if all the required fields are empty, like “ERROR: All fields are empty. Please fill in all required fields to place order.” Well I somehow solved this problem on checkout page with the code below:</p>
  
  <pre><code>add_action( 'woocommerce_after_checkout_validation', 'show_one_err', 9999, 2);
  function show_one_err( $fields, $errors ){
      // if any validation errors
      if( !empty( $errors-&gt;get_error_codes() ) ) {
  
          // remove all of them
          foreach( $errors-&gt;get_error_codes() as $code ) {
              $errors-&gt;remove( $code );
          }
  
          // add our custom one
          $errors-&gt;add( 'validation', 'Please fill in all required fields to place order.' );
      }
  }
  </code></pre>
  
  <p>My problem right now is how to apply these changes in Woocommerce My Account page - billing address and also in My Account - account details tab. My sole purpose of these changes is to have a consistent error notice in all Woocommerce fields (Please see attach images below). </p>
  
  <p>Checkout page</p>
  
  <p><a href="https://i.stack.imgur.com/cTyiI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cTyiI.png" alt="Checkout page"></a></p>
  
  <p>My Account - billing address</p>
  
  <p><a href="https://i.stack.imgur.com/RnVZx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RnVZx.png" alt="My Account - billing address"></a></p>
  
  <p>My Account - account details</p>
  
  <p><a href="https://i.stack.imgur.com/6ZVUd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6ZVUd.png" alt="My Account - account details"></a></p>