If a connection is misconfigured, then the connection list fails to load.

[martypitt]

For example:

jdbc {
   someDb {
      connectionName = someDb
      connectionParameters {
         database = ${config.database.name}
         host = ${config.database.host}
         username = ${config.database.username}
         password = ${config.database.password}
         port = ${config.database.port}
         
      }
      jdbcDriver = POSTGRES
   }
}

If those params aren't set, then the UI fails.