ENGCOM-4812: Fix #20111 - display variables in popup while editing existing email template #22469

Author: sidolov

app/code/Magento/Email/Model/Template.php

@@ -326,7 +326,7 @@ public function getVariablesOptionArray($withGroup = false)
                 $optionArray[] = ['value' => '{{' . $value . '}}', 'label' => __('%1', $label)];
             }
             if ($withGroup) {
-                $optionArray = ['label' => __('Template Variables'), 'value' => $optionArray];
+                $optionArray = [['label' => __('Template Variables'), 'value' => $optionArray]];
             }
         }
         return $optionArray;
@@ -418,6 +418,8 @@ public function setOptions(array $options)
     }
 
     /**
+     *  Return filter factory.
+     *
      * @return \Magento\Email\Model\Template\FilterFactory
      */
     protected function getFilterFactory()