Several hundred office workers in the vicinity of the 500 block of D Street NW got to go home early today after a construction crew ruptured a gas line in the area this afternoon. Fire crews responded to a call of a large gas leak at about 2 p.m., and several buildings in the area of 6th, 7th & D Streets and Indiana Ave. NW were evacuated as a precaution, according to D.C. Fire/EMS spokesperson…