Fix wxHMI example after upgrading wxGlade

Newer wxGlade generates code to initialize GridSizer's with empty
elements.

...
grid_sizer_1.Add(self.window_1, 1, wx.ALIGN_CENTER, 0)
sizer_2.Add((0, 0), 0, 0, 0)
sizer_2.Add((0, 0), 0, 0, 0)
sizer_2.Add((0, 0), 0, 0, 0)
sizer_2.Add((0, 0), 0, 0, 0)
...

That causes following traceback, if new buttons are added
to already full sizer.

PLCobject : Traceback (most recent call last):

File "./Beremiz_service.py", line 389, in default_evaluator
res = (tocall(*args, **kwargs), None)

File "/tmp/tmpQS8ct2/runtime_0.py", line 540, in _runtime_0_start
wx.MessageBox(_("Please stop PLC to close"))

File "/tmp/tmpQS8ct2/runtime_0.py", line 504, in Init
lambda axis:( MakeButtonFunc(self, sizer, axis+"axisMinus"),

File "/tmp/tmpQS8ct2/runtime_0.py", line 502, in <lambda>
lambda btname: MakeButtonFunc(self, sizer, btname), ActionButtons)

File "/tmp/tmpQS8ct2/runtime_0.py", line 461, in MakeButtonFunc
print sizer, btname

File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk3/wx/_core.py", line 14453, in Add
return _core_.Sizer_Add(*args, **kwargs)

PyAssertionError: C++ assertion "Assert failure" failed at
../src/common/sizer.cpp(1401) in DoInsert(): too many items (11 > 2*5)
in grid sizer (maybe you should omit the number of either rows or
columns?)


Tested with wxGlade version 0.8.3
Closes #41

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>

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<PyFile>

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  <variables/>

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  <globals>

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<![CDATA[

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from threading import Thread

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def OnConnectButton(self, event):

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  def OnWiiConnected(mac_addr):

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    self.label_2.SetLabel(

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      "Wiimote %s connected"%mac_addr 

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      if mac_addr else 

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      "Wiimote connection failed !")

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  def WiiConnected(mac_addr):

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    wx.CallAfter(OnWiiConnected,mac_addr)

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  Thread(target = Connect_Wiimote, args = (WiiConnected,)).start()

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  self.label_2.SetLabel("Press wiimote 1+2")

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  event.Skip()

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def OnDisconnectButton(self, event):

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  Disconnect_Wiimote()

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  self.label_2.SetLabel("Wiimote disconnected")

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  event.Skip()

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]]>

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  </globals>

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  <init>

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<![CDATA[

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]]>

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  </init>

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  <cleanup>

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<![CDATA[

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]]>

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  </cleanup>

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  <start>

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<![CDATA[

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]]>

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  </start>

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  <stop>

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<![CDATA[

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]]>

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  </stop>

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</PyFile>