groonga http: don't send 0 length response in chunked response
groonga http: don't send 0 length response in chunked response

komainu8/groonga,groonga/groonga,groonga/groonga,komainu8/groonga,groonga/groonga,kenhys/groonga,komainu8/groonga,naoa/groonga,komainu8/groonga,groonga/groonga,naoa/groonga,kenhys/groonga,groonga/groonga,groonga/groonga,komainu8/groonga,kenhys/groonga,komainu8/groonga,kenhys/groonga,naoa/groonga,naoa/groonga,groonga/groonga,naoa/groonga,naoa/groonga,kenhys/groonga,kenhys/groonga,naoa/groonga,kenhys/groonga,groonga/groonga,kenhys/groonga,naoa/groonga,komainu8/groonga,komainu8/groonga