Merge branch 'michele' into 'master'

Second commit

See merge request !2

scripts/node_human_helper.py

@@ -28,6 +28,9 @@ this.difficulty_service_proxy = None
 def helpUser(nextAction, board):
 	rospy.loginfo("I suggest action %s for board %s", nextAction, board)
 
+
+
+
 def helpCallback(msg):
 	id_human = ttt.getUserId()
 	id_ai = ttt.getAiId()
@@ -52,7 +55,7 @@ def callbackGripperActionExecuted(msg):
 	difficulty = msg_difficulty.data
 
 	if difficulty == 1:
-		helpCallback(None)
+		helpCallback(Empty())
 
 	if difficulty == 4:
 		# countdown