Now each filestorage account will always be returned. Defective accounts have an additional boolean field named hasError set to true. If the hasError field is present the account entry also contains the error informations. The structure of a defective account is the following:

{
id: ID,
qualifiedId: QUALI_ID,
displayName: NAME,
filestorageService: SERVICE,
isDefaultAccount: BOOLEAN,
configuration: CONFIGURATION
capabilities: ARRAY_OF_CAPABILITIES,
hasError: true,
error: ERROR_MESSAGE,
error_params: ERROR_PARAMS,
categories: CATEGORIES,
category: CATEGORY,
code: CODE,
error_id: ERROR_ID,
error_desc: DESCRIPTION
},

Since the account is defective, the root folder cannot be retrieved and will be ommited.