Fix static test failures

Author: fredden

app/code/Magento/Customer/Block/Address/Book.php

@@ -166,6 +166,7 @@ public function getAdditionalAddresses()
         try {
             $addresses = $this->addressesGrid->getAdditionalAddresses();
         } catch (\Magento\Framework\Exception\NoSuchEntityException $e) {
+            return false;
         }
         return empty($addresses) ? false : $addresses;
     }
@@ -197,6 +198,7 @@ public function getCustomer()
         try {
             $customer = $this->currentCustomer->getCustomer();
         } catch (\Magento\Framework\Exception\NoSuchEntityException $e) {
+            return null;
         }
         return $customer;
     }

app/code/Magento/Customer/Block/Adminhtml/Form/Element/Boolean.php

@@ -4,15 +4,16 @@
  * See COPYING.txt for license details.
  */
 
+namespace Magento\Customer\Block\Adminhtml\Form\Element;
+
 /**
  * Customer Widget Form Boolean Element Block
  */
-namespace Magento\Customer\Block\Adminhtml\Form\Element;
-
 class Boolean extends \Magento\Framework\Data\Form\Element\Select
 {
     /**
      * Prepare default SELECT values
+     *
      * @return void
      */
     protected function _construct()

app/code/Magento/Customer/Block/Adminhtml/Form/Element/File.php

@@ -16,8 +16,6 @@ class File extends \Magento\Framework\Data\Form\Element\AbstractElement
     protected $_assetRepo;
 
     /**
-     * Adminhtml data
-     *
      * @var \Magento\Backend\Helper\Data
      */
     protected $_adminhtmlData = null;

app/code/Magento/Customer/Block/Adminhtml/Grid/Filter/Country.php

@@ -32,6 +32,8 @@ public function __construct(
     }
 
     /**
+     * Return options
+     *
      * @return array
      */
     protected function _getOptions()

app/code/Magento/Customer/Controller/Adminhtml/System/Config/Validatevat.php

@@ -15,7 +15,7 @@ abstract class Validatevat extends \Magento\Backend\App\Action
      *
      * @see _isAllowed()
      */
-    const ADMIN_RESOURCE = 'Magento_Customer::manage';
+    public const ADMIN_RESOURCE = 'Magento_Customer::manage';
 
     /**
      * Perform customer VAT ID validation