Added error messages when the model is not whole.
Added error messages when the model is not whole.

hendrikmuhs/keyvi,narekgharibyan/keyvi,cliqz/keyvi,hendrik-cliqz/keyvi,narekgharibyan/keyvi,cliqz/keyvi,cliqz/keyvi,cliqz/keyvi,narekgharibyan/keyvi,cliqz-oss/keyvi,hendrikmuhs/keyvi,cliqz-oss/keyvi,hendrikmuhs/keyvi,hendrikmuhs/keyvi,hendrik-cliqz/keyvi,cliqz-oss/keyvi,hendrik-cliqz/keyvi,narekgharibyan/keyvi,cliqz-oss/keyvi,hendrik-cliqz/keyvi