Checks whether a local file is a CBFS Vault vault.
public func isValidVault() throws -> Bool
This method checks whether the file specified by the VaultFile property is a CBFS Vault vault that can be opened by the class. The file being checked must be fully closed when this method is called.
If the specified file is a CBFS Vault vault, this method returns true; otherwise it returns false.
Note that this method uses a simple detection mechanism; it doesn't perform a full consistency check or attempt any repairs, so applications may still need to call CheckAndRepair even if this method returns true. If an error occurs during the detection process, this method .
Note: This method cannot be called when Active is true, and cannot be called within events.