Blac Chyna and Wendy Williams share an unlikely but strong friendship. In a clip from the upcoming Where Is Wendy Williams? documentary on Lifetime, which will premiere on Saturday, February 24, the social media star, 35, made an emotional visit to the former daytime diva, 59, amid her health and personal struggles. “You’ve always been like, honest with me, and put me in my place, in the most motherly, kind way,” Chyna tells a vulnerable Williams, who took her wig off for the candid conversation in her New York City apartment. “That’s why I love you so much, because even when I was going throu…