Fixed static test failures.

Author: engcom-Echo

app/code/Magento/Sales/Block/Adminhtml/Order/Totals/Tax.php

@@ -80,11 +80,10 @@ public function getFullTaxInfo()
         }
 
         $taxClassAmount = [];
-        //phpcs:disable
-        if (empty($source)) {
+        if ($source == null) {
             return $taxClassAmount;
         }
-        //phpcs:enable
+
         $taxClassAmount = $this->_taxHelper->getCalculatedTaxes($source);
         if (empty($taxClassAmount)) {
             $rates = $this->_taxOrderFactory->create()->getCollection()->loadByOrder($this->getOrder())->toArray();

app/code/Magento/Sales/Block/Adminhtml/Order/View/Messages.php

@@ -17,8 +17,6 @@
 class Messages extends \Magento\Framework\View\Element\Messages
 {
     /**
-     * Core registry
-     *
      * @var \Magento\Framework\Registry
      */
     protected $coreRegistry = null;