[#6239] Remove RelativeLinkRewriter short-circuit
[#6239] Remove RelativeLinkRewriter short-circuit

Not sure why it was there to begin with. Asked Rick and he
didn't remember. In any case, removing it has no effect that
I could see. Tests all pass, and artifact links in emails and
web pages are still generated correctly (absolute links in
emails, and relative links in web pages).

Signed-off-by: Tim Van Steenburgh <1a3790b263e2c40611d4461ca2cdd82f6666cb61@gmail.com>

apache/allura,apache/allura,heiths/allura,lym/allura-git,apache/incubator-allura,heiths/allura,apache/incubator-allura,apache/incubator-allura,heiths/allura,lym/allura-git,apache/allura,lym/allura-git,heiths/allura,apache/allura,apache/allura,lym/allura-git,heiths/allura,lym/allura-git,apache/incubator-allura