fix error if non-latin character was entered in initial value in
data type element

Traceback (most recent call last):
File "/home/beremiz/editors/DataTypeEditor.py", line 575, in OnStructureElementsGridCellChange
value = self.StructureElementsTable.GetValue(row, col)
File "/home/beremiz/editors/DataTypeEditor.py", line 80, in GetValue
return str(value)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-2: ordinal not in range(128)
Traceback (most recent call last):
File "/home/beremiz/editors/DataTypeEditor.py", line 80, in GetValue
return str(value)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-2: ordinal not in range(128)
Traceback (most recent call last):
File "/home/beremiz/editors/DataTypeEditor.py", line 80, in GetValue
return str(value)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-2: ordinal not in range(128)

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<?xml version='1.0' encoding='utf-8'?>

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<PyFile xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:xsd="http://www.w3.org/2001/XMLSchema">

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  <variables/>

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  <globals>

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    <xhtml:p><![CDATA[]]></xhtml:p>

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  </globals>

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  <init>

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    <xhtml:p><![CDATA[]]></xhtml:p>

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  </init>

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  <cleanup>

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    <xhtml:p><![CDATA[]]></xhtml:p>

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  </cleanup>

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  <start>

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    <xhtml:p><![CDATA[]]></xhtml:p>

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  </start>

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  <stop>

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    <xhtml:p><![CDATA[]]></xhtml:p>

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  </stop>

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</PyFile>