Remove unnecessary check that required objects being deserialized to have a key_name.
Remove unnecessary check that required objects being deserialized to have a
key_name.

google-code-export/google-app-engine-django,hitrust/google-app-engine-django,brian-zhao/google-app-engine-django,termie/google-app-engine-django,jackxiang/google-app-engine-django,dila93/google-app-engine-django,ekkleesia3/google-app-engine-django