According to the Guardian

"There is a growing belief in Brusselsbthat Johnson has no intention of negotiating with the EU, but is instead driving forward with a no-deal exit with the understanding that parliament will block him and it will be necessary to call a general election.

While the cry from the wings has been "Parliament will block no deal" for a long time, that ain't necessarily so. It is by no means impossible that Parliament is unable to, leaving Johnson to call an unforced election or to struggle on trying to address any no deal issues arising with an incredibly thin majority.