Error deploying with blueprint authorizer

Hello,

We are specifying an authorizer on a blueprint and on deploy we receive the following error:

chalice/deploy/swagger.py", line 86, in _generate_security_from_auth_obj
'name': auth_config.header,
AttributeError: 'NoneType' object has no attribute 'header'

Still investigating the issue so will provide more info or a PR later. Just wanted to fill the issue in case I forget.

Thanks.

Start in chalice/deploy/swagger.py at _generate_security_from_auth_obj and reproduce deployment of a blueprint that specifies an authorizer. Trace why the authorizer configuration is None; the issue is done when that deployment completes without the reported AttributeError.

Written by the indexing model from the issue text.