What you could (and perhaps Micro Focus should) do is add "missingok"
for /var/log/novell-oes-cred-store/novell-oes-cred-store.log to
/etc/logrotate.d/novell-oes-cred-store so it stops complaining.
interesting that all of the OES2018.1 boxes I've checked have that missingok in that logrotate file. So perhaps that has been patched along the way since you posted this.
But it is missing from the /etc/logrotate.d/novell-nit causing similar errors on the systems that don't have nss volumes (i.e. without novell-nit installed/running) Added 'missingok' in those cases I've found so far.