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It was so odd when they did that. It was passed so easily - with relatively little dissent from what I remember. It seemed a fairly seismic statement of intent to me.
As I recall the Tories were never going to vote against it because it was official government policy and the Labour Party was preoccupied by its ongoing mission to turn itself into a People's Front of Judea tribute act and lacked the courage to suggest that it was a stupid idea to invoke Article 50 without having made any preparations for leaving the EU, and so Corbyn decided to put a 3 line whip in favour of the most disastrously ill-considered piece of legislation this country has seen in centuries.
There was a majority to invoke Article 50 though, a massive one. And everyone knew at the time that the default position was no deal if no withdrawal agreement could be reached. Parliament agreed to invoke A50, knowing there was no withdrawal agreement on the table at that time, and not having agreed (or even started to try and agree) what the withdrawal agreement should contain.