JanLi-air opened a new issue #2833:
URL: https://github.com/apache/apisix/issues/2833
### Issue description
config.yaml is used to override those configurations in config-default.yaml.
The problem is that some configurations are too niche to be included in
config-default.yaml. Such as proxy_protocol.
But if you override something not in config-default.yaml, you will get an
error when you init apisix.
### Environment
* apisix version (cmd: `apisix version`): 2.0
* OS: Mac
### Minimal test code / Steps to reproduce the issue
1. Add proxy protocol in config.yaml
2. Run make init
### What's the actual result? (including assertion message & call stack if
applicable)
You will get this error:
```
lua: ./bin/apisix:808: attempt to index a nil value (local 'base')
stack traceback:
./bin/apisix:808: in upvalue 'merge_conf'
./bin/apisix:805: in upvalue 'merge_conf'
./bin/apisix:805: in upvalue 'merge_conf'
./bin/apisix:849: in upvalue 'read_yaml_conf'
./bin/apisix:1015: in field '?'
./bin/apisix:1355: in main chunk
[C]: in ?
make: *** [init] Error 1
```
### What's the expected result?
make init should be able to handle this case: when a config is not defined
in config-default.yaml, but defined in config.yaml
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