It's fairly irrelevant, the last part is the important part... very rarely I do find someone who stubbornly declare that they have no other interests at all, but then I just propose for them some pastime or other that may fascinate them.
One interview was someone into rally driving and who was dreaming up HUD units in his car, to allow him to see his progress in real-time compared to those who had already raced, and to report tons of sensor based info back to the press hut.
Then there was the rock climber who wondered whether rope tension could reveal the likelihood of the tether point giving way.
Good hires raise interesting questions and then set to figuring out the many ways to answer them.
The majority of hires I've made are technical, but their pastimes are not generally "When I go home I code".
That seems like a poor choice. Are you trying to eliminate people who don't have non-technical hobbies for some reason?