fix the occasional high-risk problem，while add a invalid service in t…

[zlnice]

…he directory of /etc/chkconfig.d,execute chkconfig will coredump.

https://github.com/fedora-sysv/chkconfig/issues/83

[jamacku]

/packit rebuild-failed

[lnykryn]

I don't think the fix is correct. The idea here was, that the override can be partial, but still useful.