Improve NULL field value and data type error handling

[david-waltermire]

Committer Notes

Created unit tests to confirm behavior for when a missing field value is encountered.

In XML, the resulting value is an empty string. This is true for both <field></field> and <field/> cases. There is no great way to prevent this using XMLSchema validation, since these conditions are allowed.

Depending on the data type implementation, the XML values will result in data type format errors, which are improved in this PR.

If the XML is converted into JSON or YAML, then the resulting content will be "field": "".

In JSON and YAML. the resulting value is a null value if "field": null. These will be caught in JSON schema validation.

This is an area where normalizing behavior across JSON/YAML and XML is extremely difficult. We may explore other options in the future, but for now #205 will need to kept in the backlog.

This PR also updates the Metaschema module bindings to ensure that missing fields are addressed there, eliminating missing field value warnings that were in the old bindings.

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