The last season to be stopped before it finished was 39/40 (WW2), although it's different as only 3 games were played - nobody was awarded the title, no promotion, no relegation. If a match is abandoned part way through, the game is replayed, regardless of the score.
This is the only real precedent we have of any kind. Both result in essentially pretending that event did not exist, and it's started over from scratch.