null reference error in WDE when c-sdk sends service events with nil data

[mary-dcouto]

I recreated this issue, I created an identity, enabled MFA from WDE, added services into the service-policies, then I deleted the identity from the controller. Then when I try to start the tunnel, it started crashing. There is a null refernce error in WDE, I will add a null check. I also see a service event with nil valus in removed, added and updated list. Fingerprint and ziti context were also nil in this case