how to make a "if not touching anything then" statement?

So I am making a destructible car, and I am making a script that prevents any bricks from levitating.

I need a "if not touched then" statement. I searched for an hour or 2, and I couldn't find anything I need.

Here is my script, but its the opposite of what I want:

local function onTouch(otherPart) print("test1") script.Parent.WeldConstraint:Destroy() -- this is the thing i want it to do when not touching
--any parts at all end

script.Parent.Touched:Connect(onTouch)

Sorry for any bad spelling errors, or the fact that I can't make a good script, I am a noob in both lua and english.