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

     1

#!/usr/bin/env python

     2

# -*- coding: utf-8 -*-

     3

     4

# This file is part of Beremiz runtime.

     5

#

     6

# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

     7

#

     8

# See COPYING.Runtime file for copyrights details.

     9

#

    10

# This library is free software; you can redistribute it and/or

    11

# modify it under the terms of the GNU Lesser General Public

    12

# License as published by the Free Software Foundation; either

    13

# version 2.1 of the License, or (at your option) any later version.

    14

    15

# This library is distributed in the hope that it will be useful,

    16

# but WITHOUT ANY WARRANTY; without even the implied warranty of

    17

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    18

# Lesser General Public License for more details.

    19

    20

# You should have received a copy of the GNU Lesser General Public

    21

# License along with this library; if not, write to the Free Software

    22

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

    23

    24

from __future__ import absolute_import

    25

import os

    26

    27

from runtime.PLCObject import PLCObject, PLCprint, MainWorker

    28

import runtime.ServicePublisher