JcrConfigurationSource currently does a few things wrong:
Compare info.magnolia.config.source.jcr.JcrConfigurationSource#newProvider with info.magnolia.config.source.yaml.YamlConfigurationSource#loadAndRegister

• errors are lost instead of being kept in the provider for further inspection
• metadata is created using information from the bean, which prevents the above (metadata HAS to be there for the definition to be registered)
  • as a consequence we could be accidentally registered an "empty" provider