Skip json conversion of invalid attributes.

[0mdc]

Motivation and Context

This changeset prevent crashes when serializing invalid objects. This is the case for configs with MISSING attributes, which happens when using llm configs.

How Has This Been Tested

Tested on HITL with LLM configs.

Types of changes

• [Bug Fix] (non-breaking change which fixes an issue)

Checklist

• [x] My code follows the code style of this project.
• [x] I have updated the documentation if required.
• [x] I have read the CONTRIBUTING document.
• [x] I have completed my CLA (see CONTRIBUTING)
• [x] I have added tests to cover my changes if required.

[0mdc]

Is print the best tool to use here? I have been wanting to make warning/info printing move towards loggers or warnings modules.

I agree. However, the entire HITL codebase uses print(). I'll reserve that as a BE refactor.