bcrypt-credential-function fails with empty passwords
bcrypt-credential-function fails with empty passwords

So we restore treating an empty password as a missing user.

codonnell/clojars-web,tobias/clojars-web,dotemacs/clojars-web,technomancy/clojars-web,nberger/clojars-web,tobias/clojars-web,tobias/clojars-web,ato/clojars-web,dotemacs/clojars-web,ato/clojars-web,clojars/clojars-web,codonnell/clojars-web,xeqi/clojars-web,clojars/clojars-web,technomancy/clojars-web,clojars/clojars-web,nberger/clojars-web,xeqi/clojars-web