fix issue, when structure data type with array field is created

Traceback (most recent call last):
File "editors/DataTypeEditor.py", line 669, in ElementArrayTypeFunction
self.RefreshTypeInfos()
File "editors/DataTypeEditor.py", line 761, in RefreshTypeInfos
self.Controler.SetDataTypeInfos(self.TagName, infos)
File "PLCControler.py", line 2075, in SetDataTypeInfos
array.baseType.setcontent(PLCOpenParser.CreateElement(
AttributeError: 'lxml.etree._Element' object has no attribute 'setcontent'

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from editors.TextViewer import TextViewer

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from plcopen.plcopen import TestTextElement

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class IECCodeViewer(TextViewer):

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    def __del__(self):

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        TextViewer.__del__(self)

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        if getattr(self, "_OnClose"):

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            self._OnClose(self)

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    def Paste(self):

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        if self.Controler is not None:

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            TextViewer.Paste(self)

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    def Search(self, criteria):

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        return [((self.TagName, "body", 0),) + result for result in TestTextElement(self.Editor.GetText(), criteria)]