If no standbys can be found in the set of connection points provided,
the fallback behavior is "any", and not "all" that does not exist.

Author: Greg Nancarrow
Reviewed-by: Laurenz Albe
Discussion: https://postgr.es/m/CAJcOf-fDaCv8qCpWH7k5Yh6zFxZeUwZowu4sCWQ2zFx4CdkHpA@mail.gmail.com