beremiz

f273ee835411
PLCOpen editor: fix exception when using file open dialog

Consequence of wxPython 3 to 4 API changes.
<?xml version='1.0' encoding='utf-8'?>
<MemoryArea xmlns:xsd="http://www.w3.org/2001/XMLSchema" MemoryAreaType="03 - Holding Registers" Nr_of_Channels="1"/>