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.
#
#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: Beremiz 1.1\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2012-09-08 01:21\n"
"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
"Language-Team: LANGUAGE <LL@li.org>\n"
"Language: \n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"

# e0e40f1a04d7450688029783c597a70d
#: ../../manual/install.rst:2
msgid "Beremiz installation"
msgstr ""

# 5e953bd727894d009ca24f196368efbe
#: ../../manual/install.rst:5
msgid "Windows"
msgstr ""

# 03cff4ee7cf34d00b1fb7b38fa005659
#: ../../manual/install.rst:6
msgid "Download installer, install."
msgstr ""

# 6acb8dbf0a7e49e580a933ea249db0f3
#: ../../manual/install.rst:9
msgid "Linux"
msgstr ""

# bc03e803fcdb4657a592f44f07394253
#: ../../manual/install.rst:10
msgid "Pre-requisites::"
msgstr ""

# 288ed8f1d1f54cd289b063ed32f254ff
#: ../../manual/install.rst:16
msgid "Prepare::"
msgstr ""

# 526e508b99f243d089c784221be33306
#: ../../manual/install.rst:21
msgid "Get Source Code::"
msgstr ""

# 8387822a9b0d44f0acfda034356c2895
#: ../../manual/install.rst:29
msgid "Build MatIEC compiler::"
msgstr ""

# 6e641f0bd7294cebbf9945f9b6f30f49
#: ../../manual/install.rst:35
msgid "Build CanFestival (optional)::"
msgstr ""

# 893b801ddc7e4136b0b27c409addf250
#: ../../manual/install.rst:47
msgid "Launch Beremiz::"
msgstr ""