Non-ticklishness is definitely a turn-off but not a complete dealbreaker. After all there are other way to explore my fetish. If they hate being tickled, I guess it depends on how much. I had an ex who didn't like being tickled but she would still let me tickle her because she knew it turned me on. If a woman hated being tickled and wouldn't let me tickle her at all, then that would probably be a turn-off.
I have a female friend who is not ticklish at all on any spots, but she loves having her feet played with and she loves to tickle torture other people