Adhoc validation returns `null` entries for some files

[tillywoodfield]

Description

Some entries in the adhoc validation database have null values for some columns, and a validation status of N/A.

For example, when calling https://api.iatistandard.org/vs/pvt/adhoc/session/?sessionId=..., some entries look similar to the below example:

{
  "guid": "...",
  "filename": "...",
  "report": {
    "valid": null,
    "summary": null,
    "fileType": null,
    "iatiVersion": null
  },
  "valid": null,
  "session_id": "...",
  "created": "2024-10-24T00:00:00.000Z",
  "validated": "2024-10-24T00:00:00.000Z",
  "class": "text-normal",
  "status": "N/A"
}

I think this is unexpected behaviour, so we need to investigate why it is happening.

Severity
Medium

It's unclear how big of a problem this is, but doesn't seem to be immediately blocking people from using IATI Validator, hence Medium.