user roles list returning many Nones as role type

def create_user_manager(self):

    self.user_manager = self.cluster.users()

def get_roles(self):

    return self.user_manager.get_roles()

[

RawRoleAndDescription(role='admin', display_name='Full Admin', description='Can manage all cluster features (including security). This user can access the web console. This user can read and write all data.', ce=True, bucket_name=None),

RawRoleAndDescription(role='ro_admin', display_name='Read-Only Admin', description='Can view all cluster statistics. This user can access the web console. This user can read some data.', ce=True, bucket_name=None), 

RawRoleAndDescription(role='security_admin', display_name='Security Admin', description='Can view all cluster statistics and manage user roles, but not grant Full Admin or Security Admin roles to other users or alter their own role. This user can access the web console. This user cannot read data.', ce=True, bucket_name=None), 

RawRoleAndDescription(role='cluster_admin', display_name='Cluster Admin', description='Can manage all cluster features except security. This user can access the web console. This user cannot read data.', ce=True, bucket_name=None), 

RawRoleAndDescription(role='bucket_admin', display_name='Bucket Admin', description='Can manage ALL bucket features for a given bucket (including start/stop XDCR). This user can access the web console. This user cannot read data.', ce=True, bucket_name='*'), 

RawRoleAndDescription(role='bucket_full_access', display_name='Application Access', description='Full access to bucket data. This user cannot access the web console and is intended only for application access. This user can read and write data.', ce=True, bucket_name='*'), 

RawRoleAndDescription(role='views_admin', display_name='Views Admin', description='Can create and manage views of a given bucket. This user can access the web console. This user can read some data.', ce=True, bucket_name='*'), 

RawRoleAndDescription(role='views_reader', display_name='Views Reader', description='Can read data from the views of a given bucket. This user cannot access the web console and is intended only for application access. This user can read some data.', ce=True, bucket_name='*'), 

RawRoleAndDescription(role='replication_admin', display_name='XDCR Admin', description='Can administer XDCR features to create cluster references and replication streams out of this cluster. This user can access the web console. This user can read some data.', ce=True, bucket_name=None), 

None, 

None, 

None, 

RawRoleAndDescription(role='data_backup', display_name='Data Backup & Restore', description='Can backup and restore a given bucket\x19s data. This user cannot access the web console and is intended only for application access. This user can read data.', ce=True, bucket_name='*'), 

None, 

RawRoleAndDescription(role='fts_admin', display_name='Search Admin', description='Can administer all Full Text Search features. This user can access the web console. This user can read some data.', ce=True, bucket_name='*'),

None, 

None, 

None, 

None, 

None, 

None, 

RawRoleAndDescription(role='query_system_catalog', display_name='Query System Catalog', description='Can look up system catalog information via N1QL. This user can access the web console, but cannot read user data.', ce=True, bucket_name=None), 

RawRoleAndDescription(role='query_external_access', display_name='Query CURL Access', description='Can execute the CURL statement from within N1QL. This user can access the web console, but cannot read data (within Couchbase).', ce=True, bucket_name=None), 

RawRoleAndDescription(role='query_manage_global_functions', display_name='Manage Global Functions', description='Can manage global n1ql functions', ce=True, bucket_name=None), 

RawRoleAndDescription(role='query_execute_global_functions', display_name='Execute Global Functions', description='Can execute global n1ql functions', ce=True, bucket_name=None), 

None, 

None, 

RawRoleAndDescription(role='query_manage_global_external_functions', display_name='Manage Global External Functions', description='Can manage global external language functions', ce=True, bucket_name=None), 

RawRoleAndDescription(role='query_execute_global_external_functions', display_name='Execute Global External Functions', description='Can execute global external language functions', ce=True, bucket_name=None), 

None, 

None, 

RawRoleAndDescription(role='replication_target', display_name='XDCR Inbound', description='Can create XDCR streams into a given bucket. This user cannot access the web console or read any data.', ce=True, bucket_name='*'),

RawRoleAndDescription(role='analytics_manager', display_name='Analytics Manager', description='Can manage Analytics local links. Can manage datasets on a given bucket. Can query datasets created on this bucket. This user can access the web console and read some data.', ce=True, bucket_name='*'), 

RawRoleAndDescription(role='analytics_reader', display_name='Analytics Reader', description='Can query datasets. This is a global role as datasets may be created on different buckets. This user can access the web console and read some data.', ce=True, bucket_name=None), 

None, 

RawRoleAndDescription(role='analytics_admin', display_name='Analytics Admin', description='Can manage dataverses. Can manage all Analytics links. Can manage all datasets. This user can access the web console but cannot read data.', ce=True, bucket_name=None), 

RawRoleAndDescription(role='mobile_sync_gateway', display_name='Sync Gateway', description='Full access to bucket data as required by Sync Gateway. This user cannot access the web console and is intended only for use by Sync Gateway. This user can read and write data, manage indexes and views, and read some cluster information.', ce=True, bucket_name='*')]