yum or dnf fails with "Error: Unable to find a match" when a package is missing

Issue

• yum or dnf commands fail if a package is not found:

# yum install telnet foo
Updating Subscription Management repositories.
Last metadata expiration check: 1:05:08 ago on Tue 15 Oct 2019 13:36:54 AEST.
No match for argument: foo
Error: Unable to find a match

• Previous versions of yum would simply ignore missing package and install the rest.