A night after Paul George was booed in Los Angeles for spurning Lakers fans last summer and San Antonio skewered Kawhi Leonard in the AT&T Center, Dirk Nowitzki’s potential final visit to the city of Boston was a glowing example of what the NBA is all about. With just over two minutes left in the game, both teams emptied their benches with the Celtics well on their way to a 114-93 blowout win over the Mavericks. A chant of “we want Dirk!” filled the TD Garden as a final tribute for the surefire first ballot Hall of Famer.