Blocklist identifier errors

{
    "shortMessage": "duplicate blocklist identifier",
    "longMessage":  "the identifier <identifier> already exists",
    "code":         "duplicate_record_code"
}

{
    "shortMessage": "Identifier not found",
    "longMessage":  "No identifier was found with id <identifierID>",
    "code":         "resource_not_found_code"
}