If you had a change in marital status in the year, you would still be entitled to claim certain credits even with the breakdown of the relationship. In your case, you have gone from separated to Divorced. Since TurboTax does not know how long you've been separated, it asks for the spousal information, including Income, since you could still benefit from the spousal amount, and CCTB amounts may still be calculated with both incomes in mind.

If you don't know the income info, enter an amount higher than the Spousal Benefit Max. Usually $15,000 will work. The CRA will still process your return properly, and you won't be getting any credits you shouldn't.

I hope that helps.