The NHTSA has closed its investigation into the Tesla crash in Florida that killed Joshua Brown, declaring that it found no defects in the driver-assist software, and declining to issue a recall. Calling the regulator out on its “unseemly haste,” the Consumer Watchdog has taken a very aggressive stance on the ruling, which smacks of political motivation. In a review of many other Tesla crashes, the NHTSA failed to identify “any incidents in which the systems did not perform as designed,” but noted that this transitional phase to autonomous driving still requires the “continual and full attention of a driver.” The Consumer Watchdog, meanwhile, sounds like it is clamouring for a scalp – demanding that Tesla CEO Elon Musk be…