Generic error when attempting to create S3 storage profile

[dkocher]

The /api/storageprofile/s3static endpoint returns a generic error. See integration test failure in

• Add command to configure generic S3 storage profile. katta-clientlib#324.

[dkocher]

Looks like because stsRoleCreateBucketClient and stsRoleCreateBucketHub is required but should be nullable.

[dkocher]

Relates to #65.