[BUG] Server working without a JWT secret

[prunelsigma]

Server working without a JWT secret

The server is working even without specifying a app.token.secret in configuration: the server ends up signing JWT using an empty secret

Steps To Reproduce

1. Set up a configuration file without app.token.secret being defined
2. Start the server
3. Try to connect

Expected behavior

The server should not work with an empty secret (insecure) or at least write a warning in the logs.
Theapp.token.secret is required but the error is currently not handled (ignored).