v1.6.4

For the assessments that doesn't run the calculations and returns null, the format changed to have the following output:

"assessment_type": {
      "code": "ASSESSMENT-FALSE",
      "eval": "No Assessment",
      "message": "No assessment performed",
      "refer": "no",
      "target": "",
      "tfl": "GRAY",
      "value": ""
}

The value and target may or may not have any data according to different assessment types.

The generic error format is changed from simple string to an error object like the following:

{
    "category": "assessments",
    "key": "assessment_type",
    "messages": [
        "... error messages ...",
        "... as a list of strings ..."
    ]
}