The Holonet page has T7 as a he... I'm trying to remember the nutty woman on Pub Nar Shadaa who wants her droid back. I think she calls it a 'he', but I might be getting her confused with the 'overly attached' woman from Kotor. They're both bonkers, so maybe they don't count.
Hmmm, it also appears from youtube that the JK calls T7 a he. Maybe it was Master Orgus that used 'it'? It's been a while since I did that storyline but I'm sure there was someone.