get sender address type only if sender is set

src/Exceptions/NoSenderDefinedException.php

@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * https://www.d3data.de
+ *
+ * @copyright (C) D3 Data Development (Inh. Thomas Dartsch)
+ * @author    D3 Data Development - Daniel Seifert <support@shopmodule.com>
+ * @link      https://www.oxidmodule.com
+ */
+
+declare(strict_types=1);
+
+namespace D3\LinkmobilityClient\Exceptions;
+
+class NoSenderDefinedException extends LinkmobilityException
+{
+
+}