Check your SMP server configuration and make sure Rewrite URL is in backend. Also make sure you are using enterprise signed certificates in SMP listener as the included self-signed certificates won't work. Usually when I see a blank page on Fiori CLient when going through SMP it's because SMP can't reach the backend or backend certificate certificates are missing from SMP keystore.
What URL do you have configured in SMP and what URL do you have configured in Client?
Regards,
Kevin Bates