nats-io / nats-server / 5886847661

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config: allow empty configs, but prevent bad configs (#4394)

Allows again empty configs and improves support for detecting some types
of invalid configs:

- Adds reporting the line with the bad key position that makes the
config invalid.

```
nats-server: config is invalid (foo.conf:1:2)
nats-server: error parsing include file 'included.conf', config is invalid (included.conf:2:2)
```

- Fixes a few tests with trailing braces which were being handled as
keys and ignored before.

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