MAGETWO-91555: Admin orders can result in a customer with an example email address

- Removed no longer applicable cases

Author: Joan He

dev/tests/integration/testsuite/Magento/Sales/Model/AdminOrder/CreateTest.php

@@ -519,20 +519,14 @@ public function testCreateOrderNewCustomerWithFailedFirstPlaceOrderAction(
      * Email before and after failed first place order action.
      *
      * @case #1 Is the same.
-     * @case #2 Is empty.
-     * @case #3 Filled after failed first place order action.
-     * @case #4 Empty after failed first place order action.
-     * @case #5 Changed after failed first place order action.
+     * @case #2 Changed after failed first place order action.
      * @return array
      */
     public function createOrderNewCustomerWithFailedFirstPlaceOrderActionDataProvider()
     {
         return [
             1 => ['[email protected]', '[email protected]'],
-            2 => ['', ''],
-            3 => ['', '[email protected]'],
-            4 => ['[email protected]', ''],
-            5 => ['[email protected]', '[email protected]'],
+            2 => ['[email protected]', '[email protected]'],
         ];
     }