message: Use default robot if OT_ROBOT_CONFIG envvar is not defined
diff: @@ -12,7 +12,7 @@ import os
  PLUNGER_CURRENT_LOW = 0.1
  PLUNGER_CURRENT_HIGH = 0.5
  -current_robot = os.environ['OT_ROBOT_CONFIG']
  +current_robot = os.environ.get('OT_ROBOT_CONFIG', 'B2-5')
  robot_config = namedtuple(
  'robot_config',
  