cronie 1.7.0 sends error emails "/etc/default/anacron: No such file or directory"

[sbraz]

Hi,
As reported in https://bugs.gentoo.org/915724, since b53221f, 0anacron attempts to source a non-existing file because no /etc/default/anacron gets installed.
It sends this kind of errors by email:

/etc/cron.hourly/0anacron: line 11: /etc/default/anacron: No such file or directory
run-parts: /etc/cron.hourly/0anacron exited with return code 1

I'm pinging @fgozzini who authored the commit. It would be nice to restore the test -r check that was present in the first version of #115.

[sbraz]

I've offered a fix in #160.

[t8m]

I've merged the other PR as I've read it first in the list of PRs. Thank you for your bug report and fix anyway.

[sbraz]

No problem, adding the commit here for reference: 7700b14 (from #161).