phpmailer -- XSS in code example and default exeception handler

PHPMailer reports:

Fix XSS vulnerability in one of the code examples, CVE-2017-11503. The
code_generator.phps example did not filter user input prior to output. This
file is distributed with a .phps extension, so it it not normally executable
unless it is explicitly renamed, so it is safe by default. There was also an
undisclosed potential XSS vulnerability in the default exception handler
(unused by default). Patches for both issues kindly provided by Patrick
Monnerat of the Fedora Project.