task#4858 fix contact formatter error

Author: B24io

CHANGELOG.md

@@ -1,4 +1,7 @@
 # loyalty-php-sdk
+## 0.1.3 (6.08.2019)
+* fix contact formatter error
+
 ## 0.1.2 (5.08.2019)
 * add transport `Bitrix24\Contacts\Transport\Admin`
 

src/Bitrix24/Contacts/Formatters/Contact.php

@@ -32,7 +32,7 @@ public static function toArray(Contacts\DTO\Contact $contact): array
                 $contact->getMobilePhone()->getCountryCode(),
                 $contact->getMobilePhone()->getNationalNumber()
             ),
-            'email' => (string)$contact->getEmail(),
+            'email' => $contact->getEmail() !== null ? (string)$contact->getEmail() : null,
             'address' => $contact->getAddress() !== null ? $contact->getAddress()->toArray() : null,
             'origin_id' => $contact->getOriginId(),
             'originator_id' => $contact->getOriginatorId(),