Fixed #19355 -- Improved LiveServerThread's handling of exceptions. Thanks to flub for the report.

                        (self.host, port), QuietWSGIRequestHandler)

                except WSGIServerException as e:

                    if (index + 1 < len(self.possible_ports) and

                        hasattr(e.args[0], 'errno') and

                        e.args[0].errno == errno.EADDRINUSE):

                        # This port is already in use, so we go on and try with

                        # the next one in the list.