I'm new to Node-RED so please go easy on me here 
I have created a flow when I change a sensor from off to on it will dim down a light bulb I have in Home Assistant.
Unfortunately when the dim comes to 0 it turnes off the light. so I would like to make the flow only be allow to dim down to 1 instead of 0, is there any way I can do that.
Here's how my flow looks like now:
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