produce responses for notfound, timeout, and other error cases earlier in decision path
produce responses for notfound, timeout, and other error cases earlier in decision path

--HG--
extra : rebase_source : f09f9b9da512e7b01ecbd50c389ea3548d46c8a4

glickbot/riak,basho/riak,wwezhuimeng/riak_search,wwezhuimeng/riak_search,yangchengjian/riak,authbox-lib/riak,DavidAlphaFox/riak,GabrielNicolasAvellaneda/riak,xuejianhai/riak,basho/riak_search,biddyweb/riak,elkingtonmcb/riak,xuejianhai/riak_search,planobe/riak,xuejianhai/riak_search,laurenrother/riak,amyvmiwei/riak,planobe/riak,basho/riak_search