Observation scripts exits with AttributeError

[KaoruNishikawa]

Which is caused by invalid default value in the following methods:

necst-ros/scripts/controller/ROS_controller.py

Lines 937 to 966 in 59e7571

	@deco_check
	def read_status(self):
	"""read status
	attention!!
	-----------
	you need execution this script.
	$rosrun necst ROS_status.py 1
	or
	$python ROS_status.py 1
	"""
	self.read_sub = rospy.Subscriber("read_status", Read_status_msg, self._write_status)
	while not rospy.is_shutdown():
	if self.status:
	status = self.status
	self.status = ""
	break
	else:
	status = ""
	time.sleep(0.1)
	return status
	def _write_status(self, req):
	self.status = req
	self.read_sub.unregister()
	return