Allow to parse with json error on setting an object to an array property

[andrewtelnov]

The following JSON will produce error after Survey Model could not recover:

{
  elements: { type: "text", name: "q1" }
}

The correct JSON should be:

{
  elements: [{ type: "text", name: "q1" }]
}

However, JSON parser failed to parse it in Creator JSON Editor and show an error. The JavaScript error raised and JSON Editor doesn't show any reason of an error.