Loss of properties with value of empty list on round trip conversion

[radix0000]

There is an existing issue with multiple conversions using flatten-tool. When using flatten-tool to converting JSON to XLSX and back to JSON, properties that have a value of an empty list are lost. So for instance when starting with:

  {
    "statementID": "1dc0e987-5c57-4a1c-b3ad-61353b66a9b7",
    ...
    "publicListing": {
      "hasPublicListing": true,
      "companyFilingsURLs": ["http://example.com/"],
      "securitiesListings": []
    },
    ...
  }

the "securitiesListings" property will be missing after the round trip. This is even true when supplying a schema.