Funny you should bring that up. Of all the apps I made that is the only question in the entire process that made me pause and think.
I actually debated with myself what to do. My LSAT was low, but my GPA was high so i didn't want to be number free.
In the end since my PS really went into my good soft factors (WE, Air Force veteran, overcoming adversity, paying my own may through school, etc.) I checked the evaluate my numbers box.