Revert "Merge branch 'michele' into 'master'"

This reverts merge request !2 (merged)

scripts/node_human_helper.py

@@ -28,9 +28,6 @@ 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()
@@ -55,7 +52,7 @@ def callbackGripperActionExecuted(msg):
 	difficulty = msg_difficulty.data
 
 	if difficulty == 1:
-		helpCallback(Empty())
+		helpCallback(None)
 
 	if difficulty == 4:
 		# countdown