Properly handle extension-less files

parse

@@ -144,9 +144,9 @@ for email_file in file_list:
 				attachment_sha1 = hashlib.sha1(attachment_data).hexdigest()
 				attachment_filename = part.get_filename()
 				attachment_type = part.get_content_type()
-				attachment_extension = os.path.splitext(attachment_filename)[1][1:]
+				attachment_extension = os.path.splitext(attachment_filename)[1]
 				attachment_size = len(attachment_data)
-				attachment_destination = "%s/%s.%s" % (options['attachment_dir'], attachment_sha1, attachment_extension)
+				attachment_destination = "%s/%s%s" % (options['attachment_dir'], attachment_sha1, attachment_extension)
 				attachment_list.append((attachment_filename, attachment_type, attachment_sha1, attachment_size))
 				
 				attachment_file = open(attachment_destination, "w")