Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension

traceback:
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line 1433, in OnPouSelectedChanged
window.RefreshView()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 837, in RefreshView
self.RefreshProcessVariables()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 886, in RefreshProcessVariables
slaves = self.Controler.GetSlaves(**self.CurrentNodesFilter)
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/EthercatMaster.py", line 341, in GetSlaves
for slave in self.Config.getConfig().getSlave():
<type 'exceptions.AttributeError'>:_'lxml.etree._Element'_object_has_no_attribute_'getSlave'

Steps to reproduce problem:

- Add new EtherCAT master
- Add new EthercatNode to the master
- double click on


this is looks like dirty hack to fix strange problem with initial[0]
changing its type after returning from _init_ method to lxml.etree._Element
As a result all methods generated by class factory are lost.

For example, in function initMethod initial[0].__class__ points to
xmlclass.xmlclass.Config. After map(self.append, initial)
self.Config.__class__ is 'xmlclass.xmlclass.Config' as well.
But after returning from initMethod (_init) in CreateElement
self.Config.__class__ has changed to lxml.etree._Element.


I've noticed similar behavior if copy/deepcopy is used for any child
of etree.ElementBase. See simple example below.
[-------------------------------------------------------------]
#!/usr/bin/python

from __future__ import print_function
from lxml import etree
import copy

class DefaultElementClass(etree.ElementBase):
def getLocalTag(self):
return etree.QName(self.tag).localname


def printInformation(x):
print(x, x.__class__, "getLocalTag" in dir(x))


a = DefaultElementClass()
printInformation(a)

#
printInformation(copy.copy(a))
printInformation(copy.deepcopy(a))
[-------------------------------------------------------------]

# SOME DESCRIPTIVE TITLE.
# Copyright (C) is 21st century inquisition
# This file is distributed under the same license as the Beremiz package.
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
#
msgid ""
msgstr ""
"Project-Id-Version: Beremiz 1.1\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2012-09-08 00:41\n"
"PO-Revision-Date: 2012-09-07 10:53+0100\n"
"Last-Translator: \n"
"Language-Team: \n"
"Language: \n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"X-Poedit-Language: French\n"
"X-Poedit-Country: FRANCE\n"
"X-Poedit-SourceCharset: utf-8\n"

# c9c5ea5d04e64cb6a54fcda391cb4929
#: ../../manual/install.rst:2
msgid "Beremiz installation"
msgstr "Installation de Beremiz"

# 3f78e50eff364a0abbfcb8cf9a0a68da
#: ../../manual/install.rst:5
msgid "Windows"
msgstr "WIndows"

# 963db7a095b246d68c4a51163b441952
#: ../../manual/install.rst:6
msgid "Download installer, install."
msgstr "Téléchergez l'installeur, exécutez le."

# 87380693201647979e3c0d0527205575
#: ../../manual/install.rst:9
msgid "Linux"
msgstr "Linux"

# 0c4d6e88a20248b9bc3b167cf120c318
#: ../../manual/install.rst:10
msgid "Pre-requisites::"
msgstr "Pre-requis::"

# ced14d340a194a2b9f53b8e6c34d6804
#: ../../manual/install.rst:16
msgid "Prepare::"
msgstr "Préparation::"

# f555cb10ef0d42d6bbbe2f85f0763057
#: ../../manual/install.rst:21
msgid "Get Source Code::"
msgstr "Obtenir le code source::"

# 1d5926626d3b49d891529b9fc687fec3
#: ../../manual/install.rst:29
msgid "Build MatIEC compiler::"
msgstr "Compiler le compilateur MatIEC::"

# 166772d03f6f4d67abb4ed849fc3f6d8
#: ../../manual/install.rst:35
msgid "Build CanFestival (optional)::"
msgstr "Compiler CanFestival::"

# 39a65c2b7ca747438a15d31bd4a40a4f
#: ../../manual/install.rst:47
msgid "Launch Beremiz::"
msgstr "Lancer Beremiz::"