Ignite apps can panic on chain get when running inside a Go module

[jeronimoalbi]

Ignite apps that access the chain instance through the client API die when running from a directory that contains a Go module and a Git repository because that directory is considered a valid app chain.

The error is triggered when accessing the first validator, which is mandatory, which in this case is not configured because the default configuration is used before a validator is initialized. The default config is used because a directory with a go.mod and a .git folder is initially considered an app chain but because it isn't it doesn't contain a config file.

[jeronimoalbi]

This issue won't commonly happen, but it should be fixed so this case is handled without generating a panic