Attempt to workaround problem reported about empty plc.xml after unrelated crash. Now, if etree model is corrupted in a way tostring() would generate an empty string, exception prevents saving.
// widget_back.ysl2
template "widget[@type='Back']", mode="widget_class"
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class BackWidget extends Widget{
on_click(evt) {
if(jump_history.length > 1){
jump_history.pop();
let [page_name, index] = jump_history.pop();
switch_page(page_name, index);
}
}
init() {
this.element.setAttribute("onclick", "hmi_widgets['"+this.element_id+"'].on_click(evt)");
}
}
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