Provide actionable error message when Jackson can't serialize in native-mode

[geoand]

The idea here is to gives users an actionable error message when Jackson throws something like the following:

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.acme.rest.json.Legume and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS)

which users would likely not know what to do with