This patch logs unconditionally when a trace path doesn't exist.
We also provide FailSafe versions of Config::Connect and
Config::ConnectWithoutContext. These should be used
when you can't be sure that a trace path exists in the current model.
This resolves the warnings from AnimationInterface::ConnectCallbacks()
Credit to "InquisitivePenguin (GCI 2019) <>" for diagnosing this issue,
opening the way to a solution.
5879700a90