By Deepa Seetharaman, Supantha Mukherjee and Krystal Hu SAN FRANCISCO/STOCKHOLM, Dec 16 – Last spring, CellarTracker, a wine-collection app, built an AI-powered sommelier to make unvarnished wine recommendations based on a person’s palate. The problem was the chatbot was too nice. “It’s just very polite, instead of just saying, ‘It’s really unlikely you’ll like the…