FIX #9037 Fix checked attachments

modules/sendmail/mail_form.php

@@ -818,6 +818,7 @@ if ($mode == 'add') {
                             .'" title="'.$description
                             .'"><input style="margin-left: 3px" type="checkbox" id="join_attachment_'.$id.'" name="'.$inputName.'"';
 
+                        $checked = '';
                         if (($isVersion && in_array($id, $emailArray['attachments_version'])) || (!$isVersion && in_array($id, $emailArray['attachments']))) {
                             $checked = ' checked="checked"';
                         }