You misunderstand what no-deal is, and how it is achieved. You don't have to vote for it. In the same way that you don't have to go to a shop and bargain with a shopkeeper in order not to buy anything. Not having a deal is what happens if you don't agree a deal.
"There is an infallible way to identify politicians and commentators who have not read Article 50 of the Lisbon treaty. What gives their game away is the complacent and mistaken assertion that a no-deal Brexit is impossible on the grounds there is no majority for it in the House of Commons. The reality is that a campaign to undo the 2016 referendum is virtually impossible without the explicit support of the government."
I do understand it.
Yes what you say is true, in theory.
In practice there is almost no support for a 'no deal' scenario within parliament. I would suggest in the event of no withdrawal agreement being signed then we will be asking for article 50 to be extended.
It is being used as a fear tactic to muster support for the current deal