Restaurateur Alpana Singh, former host of “Check, Please!” on WTTW-TV Channel 11 and master sommelier, has successfully avoided the dreaded sophomore slump with the opening of her latest dining hot spot — Seven Lions.Occupying a cavernous Michigan Avenue space across from the Art Institute of Chicago, Seven Lions still manages to evoke a sense of intimacy where patrons can settle into vintage-inspired velvet lounges and focus on conversation, even when the space is packed to capacity.As expected, Singh …