expr: reject: Do not print unset values in json

It changes the parse and the snprint functions to omit unset values.

If It uses this rule:
nft add rule ip test output input

It gets this json file:
[...] "expr":[{"type":"reject","type":0,"code":0}]}

Now, That rule creates this json file without null values:
[...] "expr":[{"type":"reject"}]}

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

0 files changed, 0 insertions, 0 deletions