This is just a best-practice thing, preventing people browsing around your webserver inappropriately.
Created attachment 28629 [details] [review] Bug 12350 - disable apache indexes Test plan: * Go to http://library/opac-tmpl and check you get a 403 error instead of a directory listing.
Patch pushed to master. Thanks Robin!
Pushed to 3.16.x for inclusion in 3.16.1.