Delete icon from artless gauge

Hello, I'm using artless gauge and I found in the documentation how to set an icon with function node: msg.control = {icon:"iconify-fluent:battery-charge-20-regular"}

but I dont figure out how to delete this icon with function. I want to show the icon only when something happens. When my payload is 0 then I dont want to show the icon, how to achieve that?

This is not documented cos I never thought it would be necessary. But here you are. :slight_smile:

 msg.control = {icon:"fa-fw"}
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