These filters are only use to interchange data between clients and daemons.
They don't belong to the parsers package.
Signed-off-by: David Calavera <david.calavera@gmail.com>
It makes the behavior completely consistent across commands.
It adds tests to check that execution stops when an element is not
found.
Signed-off-by: David Calavera <david.calavera@gmail.com>