Gas Pipe Elemental Sensor doesn't output green when None is selected and nothing is pipe

I like this.

This extends to all sensors that detect an element. Adding 'None' or 'Empty' as an entry we could choose for actual play would be very useful indeed. This would add what could be considered a simple presence detection function without the need for an additional sensor in our collection.

Going with the liquid sensor and taking the unconfigured state as an example, "None" should start unselected instead and the "No Filter Selected" could be displayed next to either output (Not necessarily 'Output 2'):