I see it now 🙂
There is a similar node to what you are looking for (I think), which is the Conditional Decorator. It has only one child and takes a condition (which can be inverted of course like all conditions can). So it can be used like “If NOT [condition]” then it returns. The main difference here is that it will return Failure (instead of Success like in your case), but I could add an option in the Conditional Decorator inspector for what to return in case the condition is false (instead of always returning Failure as it is now).