MAGETWO-46808: [GITHUB] Admin order creation fails when "Include Tax In Order Total" set to yes #2675

 -- fixed undefined tax index when on backend order page when tax_amount is 0

Author: Robert He

app/code/Magento/Sales/view/adminhtml/templates/order/create/totals/tax.phtml

@@ -6,7 +6,9 @@
 
 // @codingStandardsIgnoreFile
 
+$taxAmount = $block->getTotal()->getValue();
 ?>
+<?php if (($taxAmount == 0 && $this->helper('Magento\Tax\Helper\Data')->displayZeroTax()) || ($taxAmount > 0)): ?>
 <?php global $taxIter; $taxIter++; ?>
 <?php if ($this->helper('Magento\Tax\Helper\Data')->displayFullSummary()): ?>
 <?php $isTop = 1; ?>
@@ -50,3 +52,5 @@
     </td>
     <td style="<?php /* @escapeNotVerified */ echo $block->getTotal()->getStyle() ?>" class="admin__total-amount"><?php /* @escapeNotVerified */ echo $block->formatPrice($block->getTotal()->getValue()) ?></td>
 </tr>
+<?php endif;?>
+

app/code/Magento/Tax/Model/Sales/Total/Quote/Tax.php

@@ -311,15 +311,13 @@ public function fetch(\Magento\Quote\Model\Quote $quote, \Magento\Quote\Model\Qu
             $area = 'taxes';
         }
 
-        if ($amount != 0 || $this->_config->displayCartZeroTax($store)) {
-            $totals[] = [
-                'code' => $this->getCode(),
-                'title' => __('Tax'),
-                'full_info' => $applied ? $applied : [],
-                'value' => $amount,
-                'area' => $area,
-            ];
-        }
+        $totals[] = [
+            'code' => $this->getCode(),
+            'title' => __('Tax'),
+            'full_info' => $applied ? $applied : [],
+            'value' => $amount,
+            'area' => $area,
+        ];
 
         /**
          * Modify subtotal