We almost never define $serveraliases which means that it's always going
to be empty. Puppet 4 is more strict about types and converting undef to
nil so this change makes sure that an undefined variable doesn't
accidentally get evaluated as existing and cause an invalid apache
In the places where we're already just comparing @serveraliases to nil,
just leave them alone. Nil should be the expected value for undefined
variables going forward in puppet 4, so as long as it's working in
puppet 3 let's keep it.
The legacy redirects that are on old-wiki.o.o should go away. But they
certainly should stop being served by old-wiki.
Note, this excludes quantum, which is a dead redirect anyway and
workitems which never really got off the ground and only contains out of
date info from diablo-4.