The error checking would itself cause a traceback. The load_config()
function that we'd need to check for errors from only returns None so
there's no way to check for errors via the return value. In the future
someone could rewrite the load_config function to return useful
information and restore the error checking but for now this is better as
it won't traceback on success and it will let us turn on static analysis
of undefined variables
Fixes#27255
References #27254
8b34e31e05