Check if entity data is not null

I wanna use current_explosion_impact_pos to see if a player has been in an explosion recently but the actual values don't matter since it's just the position I just want to run a command if there's a value there at all not sure how to do that. I wanted to use scoreboards storing one of the coordinates but if the explosion happens on a "0" it wouldn't work, definitely an edge case but I'm wondering if there's any better solution for this