Interesting, let me see if I have any FFT to review for my next round. I just tried it on my “All” review, and there it is still working as expected (i.e. pressing “enter” on the blank field doesn’t do anything).
Edit: Nope, tried at various points throughout my 100 round of FFT reviews, and all still in order for me at least, even though I did encounter some strange cases where one of the accented characters (and some of the others seem to be selected on occasion, but that didn’t seem to affect blank + enter behaviour either). [Actually I guess the strange accent selection was just because of accidental mouse-over perhaps, I guess I was being hyper-vigilant of any oddities]
P.S. In trying to show the strange apparent “selection” of accented characters (even though nothing was entered in the blank field), I noticed that others might easily verify if the “enter on an empty cloze” is still working correctly for them through the colour of the “Submit” button, though I haven’t verified that yet, but it appears a bit lighter than usual in the screenshot of the blank cloze to me.
Edit 2: Confirmed, @LuciusVorenusX, without needing to press “Enter” to test it, it seems that the “Submit” button should be appearing differently to the slightly faded version in my screenshot for you at the moment?