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Description of problem:

In case administrator makes a typo in a service definition, i.e.
{{{
[Install]
WantedBy=multiuser.target
}}}

then when enabling the service via "systemctl enable <service>" systemctl should kindly warn the poor admin that the requested target (multiuser vs multi-user) does not exist and hence the service will NOT be started automatically. 
These errors are quite hard to debug so I think SystemD should do some basic checks.

How reproducible:
always


Actual results:
systemctl blindly creates a link for the not existing target

Expected results:
systemctl should warn the admin that the target does not exist, hence the service can not be enabled

Additional info:

https://github.com/systemd/systemd/pull/15834

fix merged to github master branch -> https://github.com/redhat-plumbers/systemd-rhel8/pull/172

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (systemd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4469