Issue #25434 Add Unit Test for this case

Author: karyna-t

lib/internal/Magento/Framework/Mail/Test/Unit/AddressTest.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Framework\Mail\Test\Unit;
+
+use Magento\Framework\Mail\Address;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * test Magento\Framework\Mail\Address
+ */
+class AddressTest extends TestCase
+{
+    /**
+     * @var Address
+     */
+    protected $message;
+
+    /**
+     * Address object with nullable email parameter passed should not throw an exception.
+     *
+     * @return void
+     */
+    public function testGetEmailEmpty()
+    {
+        $address = new Address(null, "Test name");
+        $this->assertNull($address->getEmail());
+    }
+}