expr: nat: Do not print unset values in json file

It changes the parse functions to omit unset values.

Now, It possible to use a xml file like this:
[...]
      {
        "type": "nat",
        "nat_type": "snat",
        "family": "ip",
        "sreg_addr_min": 1,
        "sreg_addr_max": 1,
      }

Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

0 files changed, 0 insertions, 0 deletions