DIMGeneric can output arbitrary JSON values in string properties

[Enet4]

In the event that one of the DICOM properties in the DIM output is the string of a valid JSON object, the DIMGeneric construct interprets that string as a JSON object when printing the aggregation result to JSON.

For instance, if the patient's name happens to be {"PatientName":"Anonymous"} by mistake, the output of a searchDIM request could be the following:

{
  "numResults": 1,
  "results": [
   {
      "id": "PID123",
      "name": {"PatientName": "Anonymous"},
      "gender": "O",
      "nStudies": 1,
      "birthdate": ""
    }
  ]
}

This is not likely to happen, but if it does, it affects the entire output schema of the /searchDIM service, thus breaking the search user interface.

This happens because json-lib reinterprets values in JSONObject too freely as JSON values if they fulfill certain criteria, and there doesn't appear to be an easy way to avoid this.