Merge pull request #6 from s-kerdel/fix-attachments

Fix #5: Resolve invalid validation of attachments.

src/Email/Mailer.php

@@ -107,12 +107,7 @@ public function send($email)
             $connector = $email->getConnector();
 
             // process attachments
-            if (!empty($attachments)) {
-                $attachments = $this->prepareAttachments($message->getChildren());
-            } else {
-                // eensure empty array
-                $attachments = [];
-            }
+            $attachments = $this->prepareAttachments($message->getChildren());
 
             // process headers
             $headers = $message->getHeaders();