Nichelle Nichols, best known as Nyota Uhura on the original Star Trek series, made her final convention appearance at L.A. Comic-Con over the weekend. LIKE US ON FACEBOOK. FOLLOW US ON INSTAGRAM & TWITTER. SUBSCRIBE TO OUR YOUTUBE. As reported by PEOPLE, the “iconic actress, singer and dancer signed autographs, posed for photos and attended an early birthday celebration,” the outlet writes, as she turns 89 on Dec. 28. Per the report, several panels paid tribute to Nichols, who did not make any public statements. Nichols was diagnosed with dementia in 2018 and has since been at the center of a conservatorship battle with her son, Kyle…