Switching between two active ports

Hi!  I have a workflow that splits into two branches (to generate 3D coordinates....either with RDkit or with Corina).  If the user has Corina installed, I want to use that output, and if not then use the RDkit output.

So, I have two branches, both of which *might* be active, but I want to only use one of them. 

Is there a node that will directly achieve this "switch"?  (see attached)



To end this thread myself, the node I needed was a "Catch Errors (Data Ports)" node!