Not sure that is the case if its a no deal scenario? At the end of the Art 50 period if there is no agreement on withdrawal then the UK just leaves. Isn't this what they called the cliff edge?
May did say at one point the UK would pay what it owes, but the implication wasn't clear as to whether it would be part of a formal withdrawal agreement, or something we might offer the EU to encourage them to begin new trade talks further down the line, after we have formally left.
I still believe Brexit will now be cancelled, its just a question of whether May can blame Corbyn, or the other way around?