beremiz

Add special nodes at HMI Tree root, fix code to handle special node (no path).
svghmi
2019-08-20, Edouard Tisserant
282500e03dbc
Add special nodes at HMI Tree root, fix code to handle special node (no path).
<?xml version="1.0" encoding="UTF-8"?>
<BaseParams Name="py_ext_0" IEC_Channel="0"/>