disable a node based “on Error”

Hey, essentially I am trying to figure out error trapping via nukes expressions.

If I have a gizmo with three inputs, and I am pulling values via expressions from input3, then I disconnect input three, instead of a value I see the word ERROR. So I am assuming there should be a way to say:

If ERROR then change the value here.

I want to use this to disable nodes if certain pipes aren’t connected, and/or flip a switch on a switch node.

Thanks!

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