Suspending Parliament and preparing for No Deal are mutually exclusive, since there would also need to be various pieces of emergency legislation passed.
I really don't see last night's vote as tipping our hand -- well, obviously, I would say that wouldn't I? But in this case the point would be that a vacuous statement that Parliament doesn't want to leave without a deal does indeed do nothing to stop it, as you pointed out, so why should it make a difference? If, on the other hand, Yvette Cooper's or Dominic Grieves' amendments had passed, then you might have a case.
But as long as No Deal is a technical and real possibility then Parliament saying that it doesn't want it doesn't do the slightest thing to stop it from happening. That should presumably be enough, assuming that bring economic ruin upon us all should ever have been regarded as a bargaining chip.