If the file application_default_credentials.json is missing the function 
grpc::GoogleDefaultCredentials fails with a critical error. How to fix it?

How to check for errors?

auto Credentials = grpc::GoogleDefaultCredentials ();      <- Exception 
here before return from this function
if (Credentials) {    // It`s correct?
} else {  }  // If Error

And how to check for connect errors?

auto Channel = grpc::CreateChannel ("speech.googleapis.com", Credentials);

auto stub = GoogleSpeechAPI::Speech::NewStub (Channel);

Channel->GetState () ? 

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