Description:
When installing nftables, the default configuration (/etc/nftables.conf) creates a new table called "filter" for the inet family (IPv4 and IPv6), but loading it fails.

Additional info:
* package version: 1:0.4-1
* default config file: /etc/nftables.conf.

First, let's see that the default configuration fails:
Steps to reproduce:
1. Install nftables and libnftnl;
2. Run nft on the default configuration: `nft -f /etc/nftables.conf`;

Here is the output:
/home/jiehong/firewall.rules:2:1-2: Error: Could not process rule: Invalid argument
table inet firewall {
^^

This does not happen with a table of another family.

On the other hand, it seems that creating a table on the fly with the nft tool works, but does nothing when given a specific family.

Steps to reproduce a working example:
1. run `nft add table dummy`;
2. check that the table has been created by running `nft list tables`.

Now, if you try to create an inet, or even an ip6 table:
1. run `nft add table inet dummy2`;
2: check that the table hasn't been created with `nft list tables`.

Priority is very high, because the default configuration crashes.