Comment 3 for bug 1900439

Think of it as like adding /usr/local/bin to your path. You don't want it to error and stop searching but rather move on to say /usr/bin if what you ask for isn't there.

A common use case is when someone wants to just test out a new focal ami - they don't want to have to copy the entire upstream simplestreams set of files just to plug in an override.