API: add proper response upon trying to login with a non-existing account
API: add proper response upon trying to login with a non-existing account

matthiasmullie/forkcms,Katrienvh/forkcms,ikoene/forkcms,matthiasmullie/forkcms,gertjanmeire/davy_portfolio,mathiashelin/forkcms,riadvice/forkcms,bartdc/forkcms,tommyvdv/forkcms,jacob-v-dam/forkcms,dmoerman/forkcms,riadvice/forkcms,jeroendesloovere/forkcms,Katrienvh/forkcms,forkcms/forkcms,sumocoders/forkcms,matthiasmullie/forkcms,Saxithon/gh-pages,riadvice/forkcms,jeroendesloovere/forkcms,mathiashelin/forkcms,Katrienvh/forkcms,justcarakas/forkcms,ocpyosep78/forkcms,justcarakas/forkcms,jacob-v-dam/forkcms,jonasgoderis/jonaz,forkcms/forkcms,sumocoders/forkcms,carakas/forkcms,carakas/forkcms,ikoene/forkcms,jonasgoderis/jonaz,dmoerman/forkcms,nosnickid/forkcms,jeroendesloovere/forkcms,nosnickid/forkcms,Saxithon/gh-pages,jonasgoderis/jonaz,Thijzer/forkcms,ocpyosep78/forkcms,ikoene/forkcms,jacob-v-dam/forkcms,jonasdekeukelaere/forkcms,sumocoders/forkcms,jonasgoderis/jonaz,vytenizs/forkcms,vytenizs/forkcms,jacob-v-dam/forkcms,vytsci/forkcms,lowiebenoot/forkcms,jessedobbelaere/forkcms,WouterSioen/forkcms,Thijzer/forkcms,wengyulin/forkcms,carakas/forkcms,bartdc/forkcms,lowiebenoot/forkcms,WouterSioen/forkcms,carakas/forkcms,Thijzer/forkcms,jonasdekeukelaere/forkcms,DegradationOfMankind/forkcms,tommyvdv/forkcms,forkcms/forkcms,vytsci/forkcms,DegradationOfMankind/forkcms,wengyulin/forkcms,DegradationOfMankind/forkcms,DegradationOfMankind/forkcms,sumocoders/forkcms,dmoerman/forkcms,jessedobbelaere/forkcms,vytenizs/forkcms,jonasgoderis/jonaz,forkcms/forkcms,Katrienvh/forkcms,gertjanmeire/davy_portfolio,carakas/forkcms,jonasdekeukelaere/forkcms,vytsci/forkcms,jessedobbelaere/forkcms,jonasdekeukelaere/forkcms,justcarakas/forkcms,jonasdekeukelaere/forkcms,jessedobbelaere/forkcms,tommyvdv/forkcms,jeroendesloovere/forkcms,tommyvdv/forkcms,riadvice/forkcms,wengyulin/forkcms,mathiashelin/forkcms,bartdc/forkcms,mathiashelin/forkcms,sumocoders/forkcms,nosnickid/forkcms