display not exist error just on 404
display not exist error just on 404

just in case of a 404 the notification "The document does not
exist" is relevant.

PR: #743
PR-URL: https://github.com/apache/couchdb-fauxton/pull/743
Reviewed-By: garren smith <88e441bbc74790240af5b9cf1e4f4935d5a89fe0@gmail.com>

popojargo/couchdb-fauxton,michellephung/couchdb-fauxton,cloudant/couchdb-fauxton,garrensmith/couchdb-fauxton,popojargo/couchdb-fauxton,cloudant/couchdb-fauxton,popojargo/couchdb-fauxton,apache/couchdb-fauxton,cloudant/couchdb-fauxton,garrensmith/couchdb-fauxton,robertkowalski/couchdb-fauxton,robertkowalski/couchdb-fauxton,robertkowalski/couchdb-fauxton,apache/couchdb-fauxton,robertkowalski/couchdb-fauxton,michellephung/couchdb-fauxton,garrensmith/couchdb-fauxton,cloudant/couchdb-fauxton,popojargo/couchdb-fauxton,garrensmith/couchdb-fauxton,michellephung/couchdb-fauxton,michellephung/couchdb-fauxton,michellephung/couchdb-fauxton,apache/couchdb-fauxton,apache/couchdb-fauxton