Error with getPlayerEntityId if the username is not connected to the server

getPlayerEntityId.md

This program test the function mc.getPlayerEntityId in two case.

Case 1: The user "Present" that is connected to the server Case 2: The user "Absent" that is not connected to the server

# http://eu.wiley.com/WileyCDA/WileyTitle/productCd-111894691X.html

# The Minecraft API has to be imported before it can be used
import mcpi.minecraft as minecraft

# To communicate with a running Minecraft game, you need a connection to that game.
mc = minecraft.Minecraft.create()

# Getting the list of entity (players) in the game
entityIds = mc.getPlayerEntityIds()

# For all entity (player) display their position
for entityId in entityIds:
    pos = mc.entity.getPos(id=entityId)
    mc.postToChat("entityId="+str(entityId)+"x="+str(pos.x) + " y="+str(pos.y) +" z="+str(pos.z))

mc.postToChat("+++ath 1")

# This should get the Id of user "Present"
PresentId = mc.getPlayerEntityId("Present")
mc.postToChat("Present="+str(PresentId))

mc.postToChat("+++ath 2")

# This should get the Id of user "Absent"
AbsentId = mc.getPlayerEntityId("Absent")
mc.postToChat("Absent="+str(AbsentId))

mc.postToChat("+++ath 3")

# END

Here is the result server side, no error, just an INFO but the "+++ath 3" is never reached:

[21:02:51 INFO]: [RaspberryJuice] Opened connection to/127.0.0.1:34183.
[21:02:51 INFO]: [RaspberryJuice] Starting input thread
[21:02:51 INFO]: [RaspberryJuice] Starting output thread!
[21:02:51 INFO]: entityId=14x=128.5 y=66.0 z=144.5
[21:02:51 INFO]: +++ath 1
[21:02:51 INFO]: Present=14
[21:02:51 INFO]: +++ath 2
[21:02:51 INFO]: [RaspberryJuice] Player [Absent] not found.

Here is the result client side where an Traceback is given for the call with the unexisting (not connected) user:

>>> %Run PresentAbsent.py
Traceback (most recent call last):
  File "/home/pi/AdventuresInMinecraft-Mac/MyAdventures/PresentAbsent.py", line 26, in <module>
    AbsentId = mc.getPlayerEntityId("Absent")
  File "/home/pi/AdventuresInMinecraft-Mac/MyAdventures/mcpi/minecraft.py", line 185, in getPlayerEntityId
    return int(self.conn.sendReceive(b"world.getPlayerId", name))
  File "/home/pi/AdventuresInMinecraft-Mac/MyAdventures/mcpi/connection.py", line 63, in sendReceive
    return self.receive()
  File "/home/pi/AdventuresInMinecraft-Mac/MyAdventures/mcpi/connection.py", line 57, in receive
    raise RequestError("%s failed"%self.lastSent.strip())
mcpi.connection.RequestError: b'world.getPlayerId(Absent)' failed
>>> 

I believe a gracefull return should be provided if the name used is not connected.