Regression: evaluation fails if context/environment contains nulls

[ruscoder]

Hello!

This expression worked in 2.14.0, but after 2.14.1 it started to fail:
TypeError: Cannot convert undefined or null to object

It fails here:

fhirpath.js/src/hash-object.js

Line 43 in 905f0a5

} else if (typeof value === 'object') {

I assume it happens, because of the bug in the check "typeof null" that return "object" for null as well.

Expression: QuestionnaireResponse.repeat(item).where(linkId='test').answer.value

Context:

{
   "resourceType": "QuestionnaireResponse",
   "item": [
      {
         "linkId": "test",
         "answer": [
            {
               "valueInteger": null
            }
         ]
      }
   ]
}

[ruscoder]

I created a PR that fixes it #139

[plynchnlm]

I don't think that example is valid in FHIR. See https://chat.fhir.org/#narrow/stream/179255-questionnaire/topic/answer.2Evalue.5Bx.5D.3A.20null.3F/near/352536149.

So, I am not sure we should handle this case.

[plynchnlm]

Then again, even if this case is not valid, there is a valid case for having a null, per https://build.fhir.org/json.html#primitive, which I suspect would have the same problem.

[ruscoder]

Looks like it's fixed and does not fail anymore, thanks

[plynchnlm]

Yes, in 3.9.1. Sorry we did not report back here.