It couldn’t happen to a nicer 73-year-old unreconstructed dive bar. The U District’s legendary Blue Moon Tavern is finally getting a hard-liquor license after two years of battling city authorities, who’d tried to stop the bar from expanding beyond beer and wine. The Moon’s owners claimed the city was harassing ’em on behalf of upscale demographic cleansing. The city said the Moon didn’t deserve the higher-margin beverages because many of the bar’s patrons had been caught holding or trading in non-liquid mood-alterants. The state’s sided with the owners, who might begin mixing cocktails as soon as this weekend.