Glen Sather is trying not to let the issue of Henrik Lundqvist’s contract situation linger any longer. The Rangers general manager will meet sometime next week with the franchise goaltender’s agent, Don Meehan, in hopes of wrapping up an extension. “He’s a great goaltender,” Sather said Friday at Radio City Music Hall, where the team introduced Alain Vigneault as its new head coach. “He’s 31 years old, we want him to finish his career in New York and continue to be a great goaltender for the next six or seven or eight years, depending on how long he wants to play.” Lundqvist can become an unrestricted free agent after next season, and he was measured in his enthusiasm for re-signing with the Blueshirts on the team’s breakup day a couple weeks ago. * Sather had no declaration on the future of Brad Richards, saying it was not the proper time to discuss personnel decisions. Richards is a prime candidate for the team’s second amnesty buyout, which would wipe out his $6.67 million annual salary-cap hit. Vigneault had some experience with Richards when he coached juniors at Prince Edward Island, Richards’ home area, during the 2004-05 lockout. “He was an outstanding individual,” Vigneault said. “I’m not quite sure what happened here with the Rangers. There are people here who understand the situation much better than I [do], so we’ll see what happens.”