Added checks for non-existant SDKs.
Added checks for non-existant SDKs.

yglukhov/nimx,rrenderr/nimx,qqquinta/nimx,qqquinta/nimx,qqquinta/nimx,bogdan-voevoda/nimx,rrenderr/nimx,yglukhov/nimx,bogdan-voevoda/nimx,bogdan-voevoda/nimx,yglukhov/nimx,rrenderr/nimx