Exit gracefully from sysVinit if thin not available

> These scripts should not fail obscurely when the configuration files
> remain but the package has been removed, as configuration files remain
> on the system after the package has been removed. Only when dpkg is
> executed with the --purge option will configuration files be removed.
> In particular, as the /etc/init.d/package script itself is usually a
> conffile, it will remain on the system if the package is removed but
> not purged. Therefore, you should include a test statement at the top
> of the script, like this:
>
>    test -f program-executed-later-in-script || exit 0

https://www.debian.org/doc/debian-policy/ch-opersys.html#s-writing-init

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